Character Analysis: John Updike A&P

John Updike’s story entitled â€Å"A&P† is a narration of a man who seeks for his identity and pride. The narrator of this story is also the main character – Sammy. This protagonist is a simple man – a grocery clerk and an observer.Because of this job, Sammy used to observe his costumers and the ambiance of the A&P. However, due to one situation that occurred into the grocery store, Sammy realizes many things and gives him certain actions that changed his life. Being the main character of the store, Sammy shows different emotions – happy, angry, sad, confused, and puzzled. That is why Sammy is a picture of transforming identity from the beginning up to the end of the story.In terms of sympathy towards Sammy’s character, I have seen that Updike uses different factors and elements to show emotions and actions coming from the main character. It is to provide conflict, climax, and resolution to the story. the author sympathize with Sammy’s character that can be seen in the end of the story where Sammy realizes that he has no job and the worlds will not be a better place for him anymore.This part shows sympathy in a sense that the author makes the character realize the fact of life and did not only release the solution of the conflict. Updike shows the justification and idea of Sammy after he quit his job, which is a form of sympathy to the character.Because the character comes from a middle class, the language is casual and straight. In the beginning of the story, we could see that Sammy is very observant with people or with his environment. When Sammy wants to express his feelings, he shows it directly without any form of pretention.From this fact, it defines the identity of Sammy as a normal character with dignity and pride. However, the way he describes things or people is dramatic in a sense that he provides accurate imagination to feel and understand his perceptions. As the story goes by, we could able to show t hat Sammy starts to express his actions and words together that changed his path.Sammy is easily affected by his environment. This is the most significant trait that he showed throughout the story. From the beginning up to the end of the story, Sammy establishes a concept of being affected to everything that happens in his environment. From this fact, we could distinguish that Sammy is a composition of attraction, curiosity, inferiority, and distinction. All these factors rehabilitate the mind and actions of Sammy towards other people like Quennie and Lengel.In my own observation, I can say that Sammy’s persona is dynamic because his actions and motivations are not stable. As the story goes on, Sammy’s personality elevate from one factor to another. In the beginning of the story, Sammy is an observant. When he saw Queenie in a swim suit, he started to analyze things. When Lengel enters the scene and confronts the ladies in swim suit, Sammy talks to Lengel. When Sammy t hinks that Lengel’s actions are illogical, he quits his job. His actions had a process to establish his character – not just a static formation of his identity.From all of these, I can say that Sammy is a good character that can be played. He is flexible enough to adjust in different scenarios. This is what I like with his character. Even if he is prank, direct, and ‘weird’ character, there is a concept of intelligence that lies within his persona. It shows that Sammy was not easily manipulated by his environment but he could think and become supple to show who he really is.Work CitedUpdike, John. A&P.

My college essay Essay

Your GPA, class rank, SATI and SATII scores are all important to a college admissions officer in helping to assess your academic abilities. But they are only numbers – they have no personality. What can make your application stand apart are the personal essays. The college essay will allow an admissions officer to look beyond those numbers and see you as a person. A well-written essay should convey your thoughts, attitudes, personal qualities, imagination, sense of humor and creativity. It will round out the rest of your application and help you stand out from other applicants. In the end, it is one of the only parts of your application over which you have complete control, so it is important to take the time to do your best work. WRITING THE ESSAY To write a college essay, use the same three-step process that you would use to write an essay for class: first prewrite, then draft, and finally, edit. Taking the time for this process will help you to identify a focus for your essay and gather details you’ll need to support it. Prewriting: To start, you need to organize potential ideas for the main points of your essay. Since the purpose of the essay is to share more about you with the admissions dean, begin with YOU. Brainstorm for a few minutes, making a list of your strengths and outstanding characteristics. Focus on your strengths of personality, not your accomplishments (i. e. , you are responsible, not â€Å"an Eagle Scout;† committed, not â€Å"a three-year starter for the basketball team†). Your accomplishments are important, but more appropriate for the activities section of the application. Discover your strengths by doing a little research about yourself. Ask friends, parents and teachers what they see as your strengths. Create an outline, listing several pieces of evidence from your life next to each of the strengths that you have discovered to prove your point. Look for patterns and connections in the information that you have brainstormed. Group similar ideas and events together in logical ways (i. e. , was basketball more about the sport or about the friendships? Does your passion for numbers show itself in your performance in the state math competition and your summer job at the computer store? Drafting: Getting started is often the hardest part of essay writing. Use the information that you have learned about yourself in the prewriting phase to jump-start the process. While drafting, your job is to further organize this information into a typical essay with an introduction, the body of the essay, and conclusion. The introduction gives your reader an idea of the essay’s contents and can be short when you need to be concise. Often a vivid sentence is sufficient, such as â€Å"My favorite science project was a complete failure. † The body presents the evidence that supports your main idea. Use narration and details about the incident to show rather than tell. The conclusion can be brief as well, with a few wellselected sentences that tie together the events and incidents that you’ve described and solidify the meaning they had to you. Editing: After your draft, allow yourself time to make improvements: find and correct any errors, strengthen your focus if need be, and get feedback from another reader. Remember, this is your essay, making you your own best editor. No one can tell your story. Your words and ideas are the best way to go. Let it cool; take a break from the work for a few days before beginning an edit. Does your main idea come across clearly? Do you prove your points with specific details? Is your essay easy to read aloud? Seek feedback from someone you like and trust (but someone likely to be honest about your writing). Ask them to tell you what they think the essay is really about. Did they get it right or do you need to do another edit? Edit even more, making your language simple, direct and clear. This is a personal essay, not a term paper. Most colleges set word limits for each essay, so every word counts (say, â€Å"now† instead of â€Å"in today’s society†). Proof read at least two times before thinking that you are done. Careless spelling or grammatical errors, awkward language, or fuzzy logic will make your essay memorable – for all of the wrong reasons.

Asch Conformity Experment

Asch Conformity Experment Essay The Asch Paradigm Majority Influence Introduction In this essay i will discuss the experiment that Solomon Asch’s conducted in (1950) were his main was aim was to discover how majority influence can affect one individual judgment and how pressure from the majority can pressurise one person to Conform, I will also evaluate his research method, the results and the findings he attained. Aim S Solomon Asch’s had disapproved of the Conformity experiment conducted by Muzzafer Sherriff as Asch had felt that sheriffs visual illusion known as the auto kinnect didn’t really show any results of conformity as the participants were asked to take part in an ambiguous task were they were just asked to point out how far the a light travelled in a dark room, Asch believed that Sherrifs experiment clearly had no right or wrong answer so it was impossible for the experiment to show any results of conformity in a group situation. Asch figured the only way to measure the rates of conformity was to place an individual in a group situation were they would be influenced by the majority even if they knew their group was giving incorrect answers on a task that was ambiguous and obviously correct. The Method (laboratory experiment) Asch Conformity Experment. (2018, Oct 30).

Ethical sourcing in retail industries and the problem of sweat shop Essay

Ethical sourcing in retail industries and the problem of sweat shop labour - Essay Example Only with the consumer’s strong convictions can this movement be taken ahead and for this communication of ethical issues including their damaging contribution to environment needs to be highlighted. The expansion of civilizations has been largely based on trading practices. Trade and Commerce have been drivers of extension of territorial forays in the past and, in modern days, with the royalty become defunct, even extinct in some cases, the role has been ably taken over by large companies, the Multinationals. The twin objectives of war for territorial gains of the former kingdoms and the present day Multinational remain the same; expansion of markets to cater to larger populations and obtaining cheap labour for work from the new territories. Whereas formerly they made use of slave labour, often not caring about their survival, today they pay subsistence or even less for running their factories and establishments. All the high talk of Human Rights is meant for conference tables and for the populations of the victors and not the vanquished. In the present context the Multinational need to expand their markets and in search for consumers globally they are attracted by the huge populations of the developing or the under-developed world. They take advantage by offering them the goods that they have developed for their own affluent populations. However where they face the possibility of lower sales due to the high prices they tend to manufacture their products locally for local sales at lower prices compared to their home markets. The other angle to the story is that when they face competition from their rivals who are as big and as powerful, they need to lower prices to face such competition. The obvious way out is again to manufacture their products in the underdeveloped or developing markets at lesser cost and consequently be able to lower prices to their home markets. With the demise of colonialism democracy became the chosen form of governance, barring

Response to teacher- changes in attitudes towards sex Essay

Response to teacher- changes in attitudes towards sex - Essay Example As a result of the growing influence of media on the society, American family system has been affected in a variety of negative ways. The collective effect of changing attitudes toward sex has been of weakening the family as the building block of the society. American society is becoming increasingly approving of the gay rights. Unlike the past, when homosexual tendency was considered as an abnormal behavior, homosexuality is being increasingly approved of and is being given similar status to heterosexuality. A positive effect of these changing attitudes toward sex is that sex education today has become more of a need than a choice. More people can be educated on the risks of unhealthy sexual behaviors. A negative effect, however, is that more educated people advocate in favor of abortion associating it with women’s liberty and freedom, thus increasing the rate of abortions in the country (Aulette, 2010). Overall, circumstances have become conducive for increase in the premari tal sex amongst

INTERIM PROJECT REPORT Essay Example | Topics and Well Written Essays - 2000 words

INTERIM PROJECT REPORT - Essay Example They have become an expensive and drag-back problem in many ways. Accidental though avoidable back injuries are responsible for thousands of hours of lost output in the place of work and millions of dollars in lost returns. If you add health related costs, that including employee reimbursement claims and medical care that includes a range from simple first aid to key surgeries, and the expenditures incurred by the World’s business and industries makes them slug behind. Project scope and introduction In reference to The National Safety Council 1990 "industrial accident specifics", job related accidents caused injuries to the back more than any other body parts that were studied during the1989 research study. It was noted that back injuries were responsible for twenty-two percent of all the reported cases. All industry stakeholders, including employers, workforce, customers and the economy in general are all enormously affected. (Daltroy, L.H., Iversen, M.D., Larson, M.G., Lew, R., Wright, E., Ryan, J., Zwerling, C., Fossel, A.H., Liang, M.H. (1997). A controlled trial of an educational program to prevent low back injuries. The New England Journal of Medicine, Vol. 337, Number 5, 322-328.) Guidance, education and preventive methods in work surroundings are not only a requirement for the wellbeing and safety of the workforce; they are also a legal obligation. Most countries’ labour laws require that employers meet the terms of the safety principles and policy in the place of work or they face huge fines. The aspect of plummeting the causes and frequency of back injuries in the places of work is not only critical for the well being of the workforce but also for the economic well-being of the business. As an employment prerequisite, each worker has the duty to work and act carefully on all jobs, at all times. An individual’s responsibility is to the business, their family and to an extent, themselves. (Amdam, R. P. (2010).  Insights into the S ustainable Growth of Business. Bradford: Emerald Group Pub.) Project Control It is very essential for a business like JIM’S CLEANING to make available a secure and healthy work environment. There are numerous situations where the regulations do not always comprise a specific situation hence you have to take time to constitute a level playing status and put into practice one’s own intelligence and education in order to carry out the task at hand without any injury incidents. . Any employee contributing to an injury has to explain what caused the injury thus the employer will be able to comprehend the reason and thwart any potential similar injuries. It is referred to as safety counselling. Counselling serves two essential roles: 1) To give details on how the worker contributed to the injury, hence getting to know what went wrong and how to go about the predicament. 2) To put into a document the actuality that the business is concerned about the safety of all workers and takes the necessary action to guarantee that injuries can be avoided through training. Safety counselling is not planned as a punitive action. It is simply a training means to make workers aware of what they did wrong and the procedures that should be taken to avoid similar injuries. With such kind of measures in place should an employee continue demonstrating hazardous activities or continue to defy

Homosexual in ancient China Essay Example | Topics and Well Written Essays - 1750 words

Homosexual in ancient China - Essay Example e biological men assumes the role of the female in their entire lives and could serve as partners of "male" men who on the other hand do not lose their status in society (Chinese Cultural Studies pp. 1-6 qtd in Britt Hinsch). The aspects of gender analysis views factors that pertains to sexual behavior that are commonly limited by social ethics. Homosexal behavior is mostly defined by how a particular culture actually perceives it (Chinese Cultural Studies, n.d.). Like in other countries, homosexuality or the relationship between men is common in China. Being a conservative country in many ways, Chinas Communist Party does not openly acknowledge the presence of gays in its population. Men to men relationships are considered a crime and those who engage in such intimate relationships are persecuted by the police under the anti-hooliganism laws (Aids and Homosexuality in China, 1997). the â€Å"lords and rulers of his time uses their relatives and â€Å"handsome men† as official,† paving the way for nepotism and favoritism. This practice generally leads to the mismanagement of the states affairs because the emperors, for their love and devotion to the said handsome men, do not listen to their wise counsels (Dr. Tan Chong Kee, 2007). In relation to this is the story of Mizi Xia which tells that if one gains the love of the ruler, his wisdom will be appreciated and the male concubine will enjoy numerous favors. However, if the rulers ardour has cooled, the male lovers wisdom or counsel will be rejected and he will be regarded as a criminal (Chinese Cultural Studies n.d.). Homosexuality in China was likewise prevalent during the Shang Dynasty (16th Century - 11th Century BC), where the term â€Å"Luan Feng† was used to portray homosexuality in the Shang Dynasty Historical Records. When the Han Dynasty (206BC – 220AD) came to power, majority of the Han emperors had â€Å"lovers of their same sex,† such events were noted down on historical records. There were ten

Can the theories in Machiavelli's THE PRINCE be used to justify the Essay

Can the theories in Machiavelli's THE PRINCE be used to justify the totalitarian actions and theories of Marx, Lenin and Stalin - Essay Example The totalitarian actions of several great world leaders have walked on the path he laid causing indestructible loss to the humanity as well as morals. Machiavelli's theories do justify the actions of the leaders, who sculpted the history of the human kind, but history had proved again and again total control over any community, unleashed through chameleonic actions, fear and attacking first will only fail sooner or later. Act According to the Situation Machiavelli always argued the leaders should be ready to act in a chameleonic way to preserve their power. According to him it is completely just to lure the people using various philosophies like patriotism, capitalism etc. They should never regret to change it as and when necessary, if there is a threat for their power. He says every leader should be ready to take the help of the evil to sustain power if they are compelled to do so. "...he (the leader of the state) must stick to the good so long as he can, but, being compelled be nec essity, he must be ready to take the way of the evil."(Machiavelli, 63) Both Karl Marx and Machiavelli did agree that there is an existing tension prevailing between the nobles and the common men for centuries. Both challenged the primitive believes of the previous generations. They put forward new ideas to change the world. Marx saw people as social beings whose total history is merely a class struggle. Each struggle leads to some sort of development. Machiavelli actually defines the rules and regulations for these struggles. Machiavellianism seen as a satire helps Marxists understand the evils of bourgeoisie much better. But, Karl Marx’s actions were influenced by the ideologies in the book to a great extent. While Marx and Machiavelli were two different poles when it came to society’s freedom and development, both shared similar views on acquiring power. Machiavelli has personally experienced all the brutalities like Strapeddo and confinement within a short area whi ch Marx struggled to remove from the society. He penned down the Prince with the aim of impressing his Lorenzo di Medici, the then Italian prince who had the capability to reduce his sentence (Wooton, 1994). The struggling did shape Machiavelli’s mind and gave him the capability to analyze the reason behind such issues. Machiavelli clearly described no man is good and there is no point in resolving only good means to fight or rule him. Similarly Karl Marx also agreed every man in a political animal and they need iron hands to rule them until humanity evolves into better state. Karl Marx struggled to establish a communal government where the poorest of the poor who were suppressed in every possible way would get some sort of freedom and justice. He believed it would be possible only through complete power change. His â€Å"Dictatorship of Proletariat† is the best example of how power will be shifted from one class to the other. This is what Machiavelli describes as taki ng the help of evil. Marxism actually lures people into believing everybody will be treated fair, with equality and mercy. But, the means to acquire power to materialize the same will be brutal, crushing everybody possible. In simple word Marxists can take the help of the evil to establish goodness in the world. They can kill the very mob they guaranteed freedom to achieve power. Karl Marx did have close contacts with many elite, rich

DENISON DAM (TX-OK) Essay Example | Topics and Well Written Essays - 2500 words

DENISON DAM (TX-OK) - Essay Example Ever since the dam was built, the lake has reached its spillway three times; which is 200m or 640 feet above the sea level: in 1957, 1990 and the most recent happened in 2007 (Mathews p44). The dam is renowned for its large size and power production magnitude. Though there are more dams that have been constructed ever since, it makes a good deal of contribution to the general output of the Unites States dams. It has 14 million cubic meters or 18,800,000 cubic yards of rolled –earth fill; it also produces about 250,000 megawatt of hydropower electricity annually. Lake Texoma itself provides about 154,000,000 cubic meters or 125,000-acre feet of water storage to the local communities in five permanent contracts. Additionally, the dam has offered some other benefits such as the federally owned and managed wildlife refuge areas. Through this, it has provided about 47 areas for recreational activities. These recreational areas are owned and run by the United States Army Corps of Engineers (Ojeda p85)). There are two state parks – one situated in Texas while the other is situated in Oklahoma. In addition, there is an extra 32,000 hectors or 80,000 acres of land opened for public use as hunting grounds. Lake Texoma has two main sources, which are the Washita river from, the north and Red river from the West. The minor sources of the dam that can be noted are the Little Mineral Creek, Big Mineral Creek, Rock Creek, Buncombe Creek and the Glasses Creek. Lake Texoma then drains to the main outlet, the Red River into the Denison dam. Normal elevation of the pool fluctuates from 615-619 feet which is about 187-189 meters NGVP (National Geodetic Vertical Datum. These limits depend on the time of the year. The flood control section extends the height to about 197 meters (645feet) NGVD (National Geodetic Vertical Datum). Texoma Lake has crested the Denison dam’s spillway at the level of

Discourse Analysis Assignment Example | Topics and Well Written Essays - 2750 words

Discourse Analysis - Assignment Example Through investigation of three paradigms: empirical, interpretive and critical, the research uncovered that the dominant discourse is that such bias is not present in the health services sector and that perceptions of discrimination is a product of pre-existing lack of self-esteem and lack of resiliency as a result of cultural inadequacies prevalent in aboriginal cultures. It was discovered that power is maintained in the health sector while deliberate or unconscious marginalization against aborigines dominates the Canadian social and professional sentiment about aborigines. The study concludes that while the researcher has personally observed these biased attitudes, culpability for negative health outcomes on aborigines may be attributable to these populations themselves. Despite the fact that the Canadian health care system provides a legislative framework for ensuring equity of care provision for all members of Canadian society, discrimination seems to be still prevalent in the nursing profession. Bias can be oftentimes observable when providing care to aboriginal members of society, namely against those sharing ethnic characteristics of Indian, MÃ ©tis and Inuit native peoples. Anti-aboriginal discrimination manifests itself through stereotyping, which stigmatizes these society members even in the health care environment. Long-standing stereotypes often portray aboriginals as being pervasive drug users, violent and incessantly unemployed (de Leeuw, Kobayashi & Cameron, 2011). The most prominent label marginalizing Canadian aboriginals is that they are highly dependent on welfare programs and incompetent to the degree that their affairs should be fully supervised by the Canadian federal government (Erickson, 2005). In the health care sector, Canadian aboriginals seek health services, though disproportionate in frequency to non-aboriginal patients.

Effects of U.S. Policy in the Middle East Essay Example for Free

Effects of U.S. Policy in the Middle East Essay The end of World War II was a mark and a start of a new era for mankind and the inhabitants of this planet. It completely changed the way of life of the people as well as the relationship between states. In the process of establishment of new world order where US emerged as the authoritarian state due to its strong position in the world post world war, every state either parted or joined alliances with the US. Every state has witnessed the mass destruction caused by the nuclear attack from the US on Hiroshima and Nagasaki, thus, that helped the US to establish itself completely as the super power of the world and since then its foreign policy has not been limited and spread to states even way far away to Vietnam or now even in the Europe where the Missile Shield program has already ignited yet another cold war scenario between the US and Russia. (Light Groom, 1985) The aim of this paper is to present the research carried out on the effect of the U. S. foreign policies and actions in the Middle East. The paper focuses specifically on the geographical politics as well as provides a general analysis of the different changes brought about by the policies adopted by the U. S. lobby. History Revisited With the culmination of World War there was a need to reestablish the Jews unsettled in Europe and settle them in an area where ideologically they will feel at home. This place could only be the legendary and prophesized Biblical area in the east of Mediterranean inhabited by Palestinians. During the World Wars it was also observed that Muslims supported Germans and they also needed to be properly â€Å"sized up†. (Levinson, 2008) Therefore based on historical evidences that there existed Jewish state in the area and holy scriptures have prophesized the reemergence of a Jewish state the whole theory was crafted and drafted in a way that an ideological Jewish state could emerge on world map. As outlined above US emerged the sole international force and it was backed by another so-called super power Russia in the creation of a Jewish state in the name of Israel. The state was promptly recognized by international comity of nations. Back in US the authors of Israeli nation know in their heart that the area is surrounded by Arabs who are all divided on the basis of their geographical locations and also the fact that the Saudi Arabia was crafted by Britishers, and as such though being large in area they would not go against the creation of Israel. (Ries, 2003) The divide and rule policy for Muslims paid dividends and initially their reaction were not so strong that it could create ripples in the US policy. US started fully supporting the Israel in all respects i. e. economically, armaments, political. The powerful Jewish lobby which started dominating the US politics after World War as majority of intellectual prisoners were Jewish who wholeheartedly supported US to buy freedom and also work towards a cause. Slowly the US foreign policy the authors, major authors for which were Jews started revolving to a single point that Israel must remain in existence and all those who are against the existence if Israel must pay the price. On the other hand slowly US policy also started reflecting factor i. e. back door diplomacy to soften the stand on Israel by the Arab hardliners. These needed twisting arms by creating an image of Israel in which it was proved that it is simply a might which has to be seen with fright. The Arab- Israel wars were all proving factors that Israel army is invincible. (Altunisik, Spring 2005) Over passage of time Arab rivalries were cultivated to fortify Israel and one of the most important cases was of Iraq. Saudis were supplied with AWACS for surveillance of Saudi Arabia and it was an irony that Israeli planes flew over its air space for hours both to and fro and went into Iraq, raided the Iraqi nuclear plant and they were not detected by any surveillance machinery. (Levinson, 2008) This was partly a success story of US foreign policy in which Saudis were directed to be careful about Iran but feel no threat from Israel. Critical Analysis These entire years the Jewish lobby in US was economically getting stronger and their presence in the world economic scene was absolutely critical as the world started becoming a global village and the dependency on business started getting more and more. The indulgence of business community in political fund raising became a swaying factor for all the presidents of United States and also other countries. Elections became a business venture which need to be funded and the funds could come from business community – the result was dictating the policies by businesses. Since the election campaigns in US are the costliest in the world therefore more indulgence of business community about their terms for financing the event. That is why we see that over the years the US government shave started looking towards Israel as an integral part of its foreign, economic and armament policy and Israel’s violations of human rights and violations of agreements with Palestinians are ignored or brushed aside. (Levinson, 2008) The causes of unrest in the Middle East are historical, religious, economic and geo-political. Ancient history and ancient civilizations can serve as a framework for understanding some of the existing enmity. Iranians and the Iraqis have been fighting for more than 3,000 years. However, the current unrest in the Middle East is the result of Western ethno centrism and colonialism (covert and overt), combined with religious and sectarian conflicts. The impact of US interference in the Middle East cannot be overstated. (Hafez Kenny, 2000) Indeed, the term â€Å"Middle East† is an artificial term that has no meaning except in the context of its geographical relationship to Europe. The most active period of Western interference in the Middle East was after the collapse of the Ottoman Empire and up to the present time, although there were substantial economic, military, and political interests in the Middle East for the previous two hundred years. Prior to World War I the primary interest of the Western powers in the Middle East was geo-political, mostly concerned with shipping lanes Mediterranean Sea, Black Sea, Suez Canal and Red Sea for military and economic gain. Following World War I, the primary interest of the US in the Middle East became oil, although Great Britain was already actively involved in the exploitation of Iranian oil as early as 1908 (Bostock, 2008). The possibility of large deposits of oil in Iraq had already been recognized prior to World War I (Siegman, 2008). Thus, the partitioning of the areas that had made up the Ottoman Empire and German colonial holdings, including Iraq, Jordan, Palestine, Lebanon and Syria, following World War I had the smell of oil around it. Great Britain and France, with the support of the USA, used the League of Nations to obtain mandates, colonial power, over most of the Middle East. Unfortunately, along with the exploitation of oil came the oppression of the people of the Middle East, the results of which are evident today in the lack of democratic governments in the area. Each time a country tried to become a democracy, the implied threat of the possibility of oil being withheld from the military machines of the Western powers led to the destruction of the democratic elements and to the installation of kings and dictators that served the interests of Great Britain, France and the USA (Linklater, 2000). The distortions in policy are evident from the fact that on the one hand Israel is allowed to produce arms, become nuclear and amass weapons but this is not allowed to Iraq and rather the whole Iraqi government was invaded, toppled and destructed by US. Then enters a new dimension in the international and US foreign policies all led by US. This is the Iranians toppling the Shah of Iran and creation of an Islamic Iranian state led by Ayatollah Khomeini. Initially it was felt that with the passage of time the Iranians will be looking towards Shah for finishing the Islamic rulers. However the myth soon lost its charm as over a period of time the Islamic Iran became consolidated and their presence also started motivating the masses of other neighboring countries (Levinson, 2008). US soon realized this situation and attempts were made mobilize uprisings, than economically cripple Iran and finally direct overthrow of government. All these attempts failed. Iranian government started benefitting from these failures rather capitalized all these towards their consolidation as they started mobilizing public opinions through two slogans â€Å"Death to Israel† and â€Å"America the great Satan†. These slogans were infused into the new generations by making the Tehran University as the main hub of all demonstrations and activities. The only way left was to impose economic sanctions on Iran. US led sanctions isolated Iran but being an oil exporter it was able to circumvent the sanctions (Altunisik, Spring 2005). The hatred increased with the passage of time and Iran became more vocal against Israel as it believes that US policy was dictated by Israel and Israel should be wiped of the globe. The Iranians in order to prove their ideological war against these two counties started supporting Palestinian faction Hamas openly at war with Israel and also supported Syria and its allies in Lebanon who are against Israel (Siegman, 2008). The Iranian diplomatic moves were all against the US stand on Israel and there is a great danger that if the Iranians succeed in their diplomacy and their support makes Syria and Lebanon politically and militarily strong than there is all the likelihood that other nations in the neighborhood would soon be pressurized by their people to follow suit (Frankel, 1969). This dilemma in the US policies is a thaw which needs to be taken care of as the war between Hezbollah and Israel broke the myths about the Israeli militarily might and this is an alarming situation for the architects of US foreign policy. This situation was partially addressed by Mr. Bush who declared Iran as part of â€Å"evil nexus† and also declaring Iran as a country aspiring to become nuclear state militarily. As detailed above the US policy is primarily focused on Israel to be recognized by its neighbors as a formal independent nation and above all its might should also be accepted by them. As it was also state above that back door diplomacy was also used in the region to achieve the above objectives

Adolescent Behaviors and the Challenges in Society Today Essay Example for Free

Adolescent Behaviors and the Challenges in Society Today Essay Increased awareness needs to be established so that adults can be aware of adolescent behaviors and challenges in our society today. Some issues as simple as adolescents are being ostracized because of obesity, mothers work schedule causing risky behaviors, children being raised by depressed mothers, parent stress causing adolescents not to have good self-concept, and adolescents being involved in risky behavior in order to be accepted by peers. All of these actions are causing behaviors such as teen pregnancy, self-injuries, suicide, and eating disorders. Research states many of these behaviors have high statistics coming from the home environment. The United States having the highest teen pregnancy rate all around, what are parents doing wrong and how can society be educated so that behaviors can change with adolescents in the world today. With increased awareness of what adolescents are doing, adults can be helpful to adolescents who are so desperately in need of attention? A family needs to raise their children in a Christian setting so they will have a solid foundation when they grow into adolescents because, they need to be strong enough to face the challenges, peer pressures, and behaviors of our adolescents who are not raised to know right from wrong in their environment. Because of reality of society all adolescents will be challenged to deal with other adolescent behaviors. Adolescents can’t be put into a bubble and be protected from what society has to offer. Society is proof that there is lack of guidance for adolescents in the world today. Is society proof that there is lack of guidance for adolescents in the world today? Research proves lack of guidance is evident. In this study research says that adolescent problems can stem from weight problems, peer pressure, parents work schedule, and parent stress, causing many different behaviors in adolescents. See more:  The Story of an Hour Literary Analysis Essay The discussion in one of the articles researched says that social status for adolescents depend on how your body is developed. Girls and boys are not being accepted or are not popular by peers if they are overweight. â€Å"Adolescent girls are more popular if they have the â€Å"perceived body size† and the boy’s popularity depends on the â€Å"overall muscularity† of his body† (Wang,S.S., Houshyar, Prinstein, 2006). The research in this article is based on â€Å"522 students in grades 11 and 12.† (Wang, 2006) â€Å"The research was discovered by students choosing popular kids and not so popular kids and results being those popular kids, having the perceived bodies being popular and the not so popular kids being overweight† (Wang, 2006). This research states â€Å"Messages within the media or family promoting ‘idea’ body shapes may be reinforced within adolescents’ own peer groups and associated with social rewards that are particularly salient during this developmental stage† (Wang, 2006). â€Å"Adolescents who desire to achieve high levels of status among peers may be motivated to engage in behaviors that will help them achieve an â€Å"ideal† body shape. (Wang, 2006) Do adolescents have to be socially ostracized by peers to be motivated to look the same as others to be accepted? Are we accepting these behaviors from adolescents, that they should ostracized by anyone? With appropriate guidance and education, we can help adolescents with weight problems instead of adolescents wanting to lose weight to be accepted by peers. The cultural idea for adolescents is to be slim and trim and when they are not slim and trim they react with different kinds of eating disorders. â€Å"Psychological consequences may be particularly severe during a time of life when body image is of special concern† (Feldman, 2011). Anorexia is a disorder when the person refuses to eat because they are afraid of getting fat. ( 2011) When our adolescents don’t get the proper diet it can cause health problems and psychological problems in our children. Feldman states obesity is the most common problem with our adolescents stating that, â€Å"One in 5 adolescents is overweight, and 1 in 20 can be formally classified as obese† (Feldman, 2011) Our text states why our children are becoming overweight and not getting the exercise they need to burn the calories they are eating.(2011) It is a challenge to go past a fast food place because of the affordable prices and availability. It is a challenge for family’s to eat at home. The text also states a disorder called bulimia which adolescents eat large amounts of food and then they vomit it out of their system.(2011) These disorders are very serious and can lead to many health problems. The challenge for adolescents to have the perceived body weight is hurtful to those who are considered overweight or obese. This idea of perceived body weight is causing depression which causes risky behaviors for adolescents. Another example that shows guidance is vital is in this article about peer pressure and friend influences. The article states how our adolescents are being influenced by peer pressure. Do our adolescents have to join the group norms to be accepted or are they strong enough to say no and still be liked by the group? In this research there are two categories of friends called stable friends and unstable friends. Who influence who? According to research â€Å"the more accepted friend had greater influence than the less accepted friend after the friendship was established† ( Laursen, 2012). When the stable friends were paired up with the unstable friends, the stable friends were influencing the unstable friends. (2012 ) â€Å"The stable friends being the popular group and the unstable friend being the less popular group the unstable group was being pressured by the stable groups† (Laursen, B., Hafen, C. A., Kerr, M., Stattin, H† (2012). Research stated that the unsta ble friends did not influence the stable friends. (2012) The stable friends were influencing to the unstable friends because of their status in who they were and the unstable friends were being accepted. The research shows how â€Å"adolescents alter behaviors so that they will fit in even when it comes to alcohol consumption and other deviant behaviors† (Laursen, 2012). This is a challenge even for the stable friends to be able to say no to the alcohol and other deviant behaviors. If parents would teach their children about peer pressure, use the word as something happens, the children would know when an issue comes up and they said they did it because everyone else did, let them know they allowed themselves to do the wrong thing because of peer pressure. How something as simple as parental work schedules cause risky behaviors in adolescents. Why are parental work schedules vital when it comes to adolescent risky behaviors? What are adolescents doing while parents are at work? The article provides â€Å"new evidence on the pathways linking parental work schedules with adolescent risky behaviors†( Han, W.-J., Miller, D. P., Waldfogel, J. (2010). The research states that years of night shift work for mothers indicate that the relationship between their children are not developed as to mothers who work day time jobs.(2010) Parents working to make a living are having to sacrifice having a relationship with their children. As these parents work it allows more freedom for risky behaviors. Also, while parents are working different shifts research indicates that parents don’t know what their children are doing or where their children are.(2010) â€Å"Effects were particularly evident when parents work such schedules during children’s middle childhood years but were also evident during preschool years and early adolescence†(Han, 2010). Our analyses by children’s developmental stage suggest that the number of year’s parents worked nonstandard hours at various stages of childhood influence adolescent outcomes, but in different ways depending on the stage when nonstandard shift work occurred. These results make sense given that children face very different developmental tasks during these different stages. In the middle childhood years mark a time of important changes related to school transitions, developmental advances that establish children’s sense of identity, and developing relationships with parents and peers. These years serve as a foundation for later development, and experiences during these periods can have lasting effects. (Han, 2010) The risky behaviors focused on in this article while parents are working was, â€Å"cigarette smoking, alcohol use, drug use, delinquency, and sexual behavior. With evidence of all these behaviors in adolescents because of parents work schedule, parental guidance is vital in our society today so that these behaviors will be recognized by parents so they will know that their adolescent needs some attention. This article provides facts about how much parent stress is apparent toward parenting behavior and how it reflects adolescent’s self-concept? According to the findings in this article, parent behavior reflected on their stress that they deal with daily? How does the parent behavior affect the adolescent’s self-concept? The article debates how the lax parents and stern parent’s reactions are toward adolescent’s self-concept. The parent’s relationship to the child contributes to the child’s â€Å"self-concept and well-being.† Without self-worth how can adolescents achieve what they need to accomplish in their life as they grow into adulthood. Putnick, D.L., Bornstein, M. H., Hendricks, C., Painter, K.M., Suwalsky, J.T. D.Collins, W.A. (2008)† Why is society having so many problems with adolescents? Appropriate parental guidance is vital so that adolescents can grow into healthy men and woman. However, we have adolescents growing up and being exposed to many different challenges. Being raised by a mother who has dealt with depression, the article states that the children are the caretakers of the siblings and the house. (2009) The authors stated that they observed â€Å"a 13-year old boy talked about regularly preparing dinner for his mother and younger sibling (instrumental caretaking) and a 9-year old girl offered suggestions to her mother for ways to feel better and reduce her stress at work, including setting up and appointment to talk with her boss. (Emotiona l caretaking)† (Champion,Jaser, Reeslund, Simmons, Potts, Shears,Ccompas, (2009). â€Å"Emotional and instrumental caretaking were significantly correlated with greater self-reported anxiety-depression symptoms only among adolescents whose mothers had a history of depression† (Champion, 2009).The research states that â€Å"mothers think there children are more capable if they are preforming emotional caretaking however the children feel more anxiety and depression when they are preforming those task† (Champion, 2009). How do these children stand a chance to grow and develop their needs if they are caring for depressed mother? The challenges these children face are tremendous as they grow into adult hood. They totally missed childhood and all their lives saw their mother cry, take overdose and the many other behaviors that depressed people do. These children grow cold of emotions. They don’t know how to express except the way their mother expressed. How do we expect them to grow up as good citizens? The United States having the highest teen pregnancy rate of all other countries is not making a good statement of how adolescents are seeking to get the attention they need. The authors in this article state that a â€Å"disturbing discovery that the percentage of apparently involuntary sex among female teens is a significant social problem, around 13% for ages 15-19 by one estimation† (Thomas and Dimitrox, 2007). Also another alarming fact discovered is that â€Å"over half of teens ages 15-19 have had oral sex, including roughly 25% who have not engaged in vaginal sex (2007). Seeing it as a strategy to avoid pregnancies, many teens believe that oral sex avoids the prospect of STD’s including HIV/AIDS. (Thomas, and Dimitrox (2007).† Research detects that direct effects of teen pregnancy are coming from background variables such as family poverty, early school failure, and dysfunctional family systems. â€Å"Some research suggests that most of the economic consequences of early childbearing can be explained by family background variables.†(Thomas and Dimitrox, 2007) However, research is not saying that all teen pregnancies are coming from these variables. â€Å"Recent data suggest that the number of children living in poverty in the United States would have risen by 8.3% if the teen birth rates had not declined as they did for the years 1991-2003† (Thomas , 2007). Education to adolescents and parents is vital. There are so many grandparents raising the adolescents’ babies. The adolescents never have to take responsibility for their action because they have someone to raise their child. What do they do but go have another child for their parents. Even more hurtful than teen pregnancy, would be facing a knock on the door telling you you’re adolescent tried to commit suicide or even worse committed suicide. â€Å"The institute of Medicine defines a suicide attempt as a nonfatal, self-inflicted destructive act with the explicit or implied intent to die.† (Hausmann, C., Kuhlberg, J., A., Zayas, L.H., Nolle, A., P., Cintron, S., L. 2012) We often think that these things can’t happen to us until we are faced with the issue at hand. Research says that â€Å"depression is the number one disorder diagnosed among adolescents†( Hausmann, 2012). Research also states that depression is associated with the greatest risk of suicide attempts.(2012) â€Å"Adolescents are using objects in their homes to commit suicide such as, drug overdose, knives, pieces of glass, nail files, and guns† (Hausmann, 2012). Less common attempting methods were â€Å"jumping off buildings, suffocating by placing plastic bags over their heads, and trying to hang themselves† (Hausmann, 2012). The majority of adolescents in this study had a lifetime history of two to more than six previous suicide attempts† (Hausmann, 2012). The authors state that the â€Å"Latino population adolescents are at high risk for attempted suicide† (Hausmann, 2012).† Latino population for the youth is up to 41% in the US†(Hausmann,2012). The 76 adolescents in this study have already tried suicide 2 or 3 times. The article states that adolescents will try suicide in the next 3 or 4 months and may continue trying suicide up to the next 12 years. (Hausmann, 2012) `Talk about a heartbreaking behavior for parent, siblings, whom ever involved. If parents could get some education on some of these behaviors, to reinforce that there is a problem with Adolescents growing up in society today. â€Å"The structure of the family for the last couple decades has changed in many ways. With an increase in the number of parents who both work outside of the home, soaring divorce rate, and a rise in single-parent families, the environment faced by children passing through middle childhood in the 21st century is very different from that faced by prior generation† (Feldman, 2011 pg.332). Conclusion is that a family needs to raise their children in a Christian setting so they will have a solid foundation when they grow into adolescents because, they need to be strong enough to face the challenges, peer pressures, and behaviors of adolescents today. Adolescents who go to church are not free from this kind of behaviors but have a solid rock to stand on if they know the Lord. Is society proof that there is lack of guidance for adolescents in the world today? Reference Champion, J. E., Jaser, S. S., Reeslund, K. L., Simmons, L., Potts, J. E., Shears, A. R., Compas, B. E. (2009). Caretaking behaviors by adolescent children of mothers with and without a history of depression. Journal of Family Psychology 23(2), 156-166 . Feldman S.R., (2011). Food, and Eating Disorders: Fueling the Growth of Adolescence, Development across the Life Span, Pg.365. Grella, C. E., Stein, J. A., Greenwell, L. (2005). Associations among Childhood Trauma, Adolescent Problem Behaviors, and Adverse Adult Outcomes in Substance-Abusing Women Offenders. Psychology of Addictive Behaviors, 19(1), 43-53. Han, W.-J., Miller, D. P., Waldfogel, J. (2010). Parental work schedules and adolescent risky behaviors. Developmental Psychology, 46(5), 1245-1267. Hausmann-Stabile, C., Kuhlberg, J. A., Zayas, L. H., Nolle, A. P., Cintron, S. L. (2012). Means, intent, lethality, behaviors, and psychiatric diagnosis in Latina adolescent suicide attempters. Professional Psychology: Research and Practice, 43(3), 241-248. Laursen, B., Hafen, C. A., Kerr, M., Stattin, H. (2012). Friend influence over adolescent problem behaviors as a function of relative peer acceptance: To be liked is to be emulated. Journal of Abnormal Psychology, 121(1), 88-94. Nock, M. K., Holmberg, E. B., Photos, V. I., Michel, B. D. (2007). Self-Injurious Thoughts and Behaviors Interview: Development, reliability, and validity in an adolescent sample. Psychological Assessment, 19(3), 309-317. Putnick, D. L., Bornstein, M. H., Hendricks, C., Painter, K. M., Suwalsky, J. T. D., Collins, W. A. (2008). Parenting stress, perceived parenting behaviors, and adolescent self-concept in European American families. Journal of Family Psychology, 22(5), 752-762. Thomas, C.L., Dimitrov, D. M. (2007). Effects of a teen pregnancy prevention program on teen’s attitudes toward sexuality: A latent trait modeling approach. Developmental Psychology, 43(1), 173-185.

Key Standards in Healthcare Informatics

Key Standards in Healthcare Informatics Sion Davoudi In healthcare, interoperability is the ability of different information technology systems and software applications to communicate, exchange data, and use the information that has been exchanged (What is Interoperability?, 2017). This necessary communication between systems can be achieved if consistent standards are used, and both syntactic and semantic meaning of information are defined in clear terms. When standards are consistent and implementable, they not only reduce the risks and timelines of health technologies, but also drive down costs significantly. According to Bender and Satripi (2013), the economic cost benefit of interoperability of healthcare information systems in the USA alone has been estimated at $77.8B (Bender Satripi, 2013). One relatively new standard that has been established seeks to solve these risks and realize these cost saving potentials. FHIR (Fast Healthcare Interoperability Resources) is a next generation framework created by the Health Level Seven International (HL7) organization. It combines the best features of HL7s v2 and v3 product lines while leveraging the latest web standards (Introducing HL7 FHIR, 2017). Although it closely resembles its predecessors, FHIR comes as a huge departure from previous messaging standards such as HL7 v2 and v3. FHIR was developed through an incremental and iterative approach, which allows it to reflect the contemporary standards of medical practice. The development process ensured that FHIR could adequately handle complex systems, with excellent usability that made it fit for use in the current healthcare contexts. Additionally, the system extensively uses open internet sources, making it both cheap and highly adaptable. HL7 v2 on the other hand, was not scalable and did not support jurisdictional information systems (Bender Satripi, 2013). Furthermore, it did not provide any support for any global enterprise identifiers, which made interoperability extremely difficult. The next iteration, HL7 v3 introduced the HL7 Development Framework, and used the Reference Information Model. Although it was considered an improvement over its older counterpart, the stan dard was not directly implementable and required substantial effort to generate executable software systems (Bender Satripi, 2013). FHIR supports both XML and JSON for data representation and sharing. According to the World Wide Web Consortium (W3C), XML is a set of rules, guidelines, and conventions for designing text formats for data, in a way that produces files that are easy to generate and read, that are unambiguous, and that avoid common pitfalls, such as lack of extensibility, and platform-dependency (XML in 10 points, 2017). In essence, XML is used when data is required to be share from one system to another. An example of XML code used for identification and definition of a medication is illustrated in Appendix A. Furthermore, for simplification, Appendix B illustrates how text input Hello HINF 6355! would appear in XML. FHIR in general is suitable for many times of data and contexts including mobile phone apps, cloud communications, EHR-based data sharing, and more (Introducing HL7 FHIR, 2017). While FHIR shows great promise to become a widely implemented standard, there are some criticisms of FHIR. Since FHIR creates a resource oriented environment, the implementation of its basic systems is relatively simple. However, constructing collections and interoperability relationships using base resources comes with very little guidance. The standards also use the base CRUD operations, but beyond that, there is little support for dynamic behavior (Bender Satripi, 2013). This may become a huge problem area to ensure interoperability, which is its primary task. Limitations aside, FHIR is gaining momentum and can become a widely implemented standard in coming years. Appendix A Appendix B References Bender, D., Sartipi, K. (2013, June). HL7 FHIR: An Agile and RESTful approach to healthcare information exchange. In Proceedings of the 26th IEEE International Symposium on Computer-Based Medical Systems (pp. 326-331). IEEE. Introducing HL7 FHIR. (2017). HL7.org. Retrieved 13 January 2017, from https://www.hl7.org/fhir/summary.html What is Interoperability?. (2017). HIMSS. Retrieved 13 January 2017, from http://www.himss.org/library/interoperability-standards/what-is-interoperability XML in 10 points. (2017). W3.org. Retrieved 13 January 2017, from https://www.w3.org/XML/1999/XML-in-10-points-19990327

Threatening Women of Homers Odyssey Essay example -- Homer, Odyssey E

The Threatening Women of Homer's Odyssey      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Aristotle called this poem 'a story of character' which is very true, as the analysis of people in the Odyssey id detailed and they are carefully depicted. Though the women still remain a fairly mysterious force that test Odysseus' determination for 'nostos' (hero's return home), requiring the man whose words are "like snowflakes" to use every trick he has to evade their threat, his civility not allowing him to strike them. In the Underworld, Agamemnon made it very clear in his enlightened state (consider the wiser Achilles who now regrets his noble death - "rather work the soil as a serf...than be King of all these lifeless dead" 11.490), as one of the dead that women "are no longer to be trusted". It is no co-incidence then that the female figures that Odysseus meets after this point are the most ferocious and dangerous. Both Scylla and Charybdis are hideous monsters, depicted as female, and so too are the tempting Sirens, all which test the hero. It is evidence that even after all his endeavours, Odysseus is still an Iliadic hero at heart, as he dons his armour uselessly to face Scylla's 12-headed threat and look at the good it does him ("Obstinate fool" 12.115). The actions of Odysseus' men result in him swimming in the sea and hanging over the swirling Charybdis, holding onto a fig tree ("clung like a bat" 12.433). Without warning from Circe, Odysseus would not have gone past the Sirens without doo m, since we see what the effect was without the wax in his ears ("longing to listen...set me free" 12.193). However, it is the humanoid females which are to add the most to the poem. The monsters test and batter the hero whilst the women test the man. To threaten Odysseu... ...ly). When he wishes to leave also, no effort is made by Circe to try and stop him unlike her counterpart above, Calypso ("do not stay on unwillingly" 10.484). Odysseus has been kept for the pleasure of Circe and he could have left at any time. This tarnishes our view of the hero's withstanding of the females' subtle threat.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Whether successfully or unsuccessfully, the female figure of the Odyssey all attempt to stop Odysseus on his inexorable journey home to his own female. Portrayed in contrasting depictions to draw out emphasis and focused details, the women and monsters threaten the hero in slightly different ways each time, testing Odysseus' flexibility and forcing him to break the Iliadic mould. Work Cited: Homer (Translated by Robert Fagles. Preface by Bernard Knox). 1996. The Odyssey. New York: Viking Penguin, div. of Penguin Books, Ltd. Threatening Women of Homer's Odyssey Essay example -- Homer, Odyssey E The Threatening Women of Homer's Odyssey      Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Aristotle called this poem 'a story of character' which is very true, as the analysis of people in the Odyssey id detailed and they are carefully depicted. Though the women still remain a fairly mysterious force that test Odysseus' determination for 'nostos' (hero's return home), requiring the man whose words are "like snowflakes" to use every trick he has to evade their threat, his civility not allowing him to strike them. In the Underworld, Agamemnon made it very clear in his enlightened state (consider the wiser Achilles who now regrets his noble death - "rather work the soil as a serf...than be King of all these lifeless dead" 11.490), as one of the dead that women "are no longer to be trusted". It is no co-incidence then that the female figures that Odysseus meets after this point are the most ferocious and dangerous. Both Scylla and Charybdis are hideous monsters, depicted as female, and so too are the tempting Sirens, all which test the hero. It is evidence that even after all his endeavours, Odysseus is still an Iliadic hero at heart, as he dons his armour uselessly to face Scylla's 12-headed threat and look at the good it does him ("Obstinate fool" 12.115). The actions of Odysseus' men result in him swimming in the sea and hanging over the swirling Charybdis, holding onto a fig tree ("clung like a bat" 12.433). Without warning from Circe, Odysseus would not have gone past the Sirens without doo m, since we see what the effect was without the wax in his ears ("longing to listen...set me free" 12.193). However, it is the humanoid females which are to add the most to the poem. The monsters test and batter the hero whilst the women test the man. To threaten Odysseu... ...ly). When he wishes to leave also, no effort is made by Circe to try and stop him unlike her counterpart above, Calypso ("do not stay on unwillingly" 10.484). Odysseus has been kept for the pleasure of Circe and he could have left at any time. This tarnishes our view of the hero's withstanding of the females' subtle threat.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Whether successfully or unsuccessfully, the female figure of the Odyssey all attempt to stop Odysseus on his inexorable journey home to his own female. Portrayed in contrasting depictions to draw out emphasis and focused details, the women and monsters threaten the hero in slightly different ways each time, testing Odysseus' flexibility and forcing him to break the Iliadic mould. Work Cited: Homer (Translated by Robert Fagles. Preface by Bernard Knox). 1996. The Odyssey. New York: Viking Penguin, div. of Penguin Books, Ltd.

Harry Potter And The Sorcerers Stone Essay examples -- Essays Papers

Harry Potter And The Sorcerers Stone Harry Potter starts off slow, but gets very interesting near the end. In the beginning, you meet the Dursleys, Harry’s aunt, uncle, and their son Dudley. Then you learn that Harry’s parents were witches, and that they were destroyed by a evil wizard. A good witch, Albus Dumbeldoor, sends Harry to the Dursleys, because they’re his only remaining family. The Dursleys however, hated Harry and his family, so Harry was mistreated for years. He was forced to live in a cuborrod under the stairs. He had to watch as the fat, stuck up Dudley got whatever he wanted, and then usually broke whatever it was he got. Then one day Harry got a letter. As Harry was beginning to read the letter, his uncle, Vernon Dursley, took it from him. After reading the... Harry Potter And The Sorcerers Stone Essay examples -- Essays Papers Harry Potter And The Sorcerers Stone Harry Potter starts off slow, but gets very interesting near the end. In the beginning, you meet the Dursleys, Harry’s aunt, uncle, and their son Dudley. Then you learn that Harry’s parents were witches, and that they were destroyed by a evil wizard. A good witch, Albus Dumbeldoor, sends Harry to the Dursleys, because they’re his only remaining family. The Dursleys however, hated Harry and his family, so Harry was mistreated for years. He was forced to live in a cuborrod under the stairs. He had to watch as the fat, stuck up Dudley got whatever he wanted, and then usually broke whatever it was he got. Then one day Harry got a letter. As Harry was beginning to read the letter, his uncle, Vernon Dursley, took it from him. After reading the...

How does a permanent magnet work? :: essays research papers

Some materials have a feature known as ferromagnetism. The prefix "ferro" refers to Iron, which is one such material. Ferromagnetic materials have the ability to "remember" the magnetic fields they have been subjected to. An atom consists of a number of negatively charged electrons, orbiting around a positively charged nucleus. These electrons also possess a quantity known as spin, which is roughly analogous to a spinning top. The combination of orbital and spin motions is called the angular momentum of the electron. Angular momentum is perhaps most easily understood in the case of the Earth: The earth spins about a central axis, which means it at has an angular momentum around that axis. The planets also have an angular momentum as they revolve about the sun. Now, the angular momentum of an electron is a vector quantity, meaning it has direction. The motion of the electron produces a current, which in turn generates a tiny magnetic field in the direction given by the angular momentum. Thus an atom can behave like a dipole, meaning "two poles". The direction of the orbital and spin angular momentum of the electron determine the direction of the magnetic field for the electron and the entire atom, thus giving it "north" and "south" poles. Different atoms have different arrangements of electrons into their orbits, and thus have different angular momenta and dipolar properties. A ferromagnetic material is composed of many microscopic magnets known as domains. Each domain is a region of the magnet, consisting of numerous atomic dipoles, all pointing in the same direction. A strong magnetic field will align the domains of a ferromagnet, or in other words, magnetize it. Once the magnetic field is removed, the domains will remain aligned, resulting in a permanent magnet. This effect is known as hysteresis. Few materials are actually ferromagnetic; however, all substances have a diamagnetic nature. Diamagnetism means that the molecules within a substance will align themselves to an external magnetic field. The external magnetic field induces currents within the material, which in turn result in an internal magnetic field in the opposite direction. This effect is usually quite small and disappears when the external magnetic field is removed. Some materials are paramagnetic. This is the case when the orbital and spin motions of the electrons in a material do not fully cancel each other, so that the individual atoms act like magnetic dipoles.

Ncert Physics Book

Presents NCERT Text Books NCERT Text Books: 11th Class Physics About Us: Prep4Civils, website is a part of Sukratu Innovations, a start up by IITians. The main theme of the company is to develop new web services which will help people. P rep4Civils is an online social networking platform intended for the welfare of people who are preparing for Civil services examinations. The whole website was built on open-source platform WordPress. Contact Details: Website: http://www. prep4civils. com/ Email: [email  protected] comDisclaimer and Terms of Use: By following Creative Common License, for the welfare of large student body we are merging all the PDF files provided by NCERT website and redistributing the files by giving proper credit to NCERT website and the redistribution is based on the norms of Creative Common License. We are not commercially distributing the files. People who are downloading these files should not be engaged in any sort of sales or commercial distribution of these files. They can redistribute these copies freely by giving proper credit to the original author, NCERT (http://www. ncert. nic. in/NCERTS/textbook/textbook. tm) and â€Å"Prep4Civils† (http://www. prep4civils. com/) by providing proper hyperlinks of the websites. Any sort of cliches can be addressed at [email  protected] com and proper action will be taken. CONTENTS FOREWORD PREFACE A NOTE FOR THE TEACHER CHAPTER iii v x 1 PHYSICAL WORLD 1. 1 1. 2 1. 3 1. 4 1. 5 What is physics ? Scope and excitement of physics Physics, technology and society Fundamental forces in nature Nature of physical laws CHAPTER 1 2 5 6 10 2 UNITS AND MEASUREMENTS 2. 1 2. 2 2. 3 2. 4 2. 5 2. 6 2. 7 2. 8 2. 9 2. 10 Introduction The international system of units Measurement of length Measurement of massMeasurement of time Accuracy, precision of instruments and errors in measurement Significant figures Dimensions of physical quantities Dimensional formulae and dimensional equations Dimensional analysis and its applications CHAPTER 16 16 18 21 22 22 27 31 31 32 3 MOTION IN A STRAIGHT LINE 3. 1 3. 2 3. 3 3. 4 3. 5 3. 6 3. 7 Introduction Position, path length and displacement Average velocity and average speed Instantaneous velocity and speed Acceleration Kinematic equations for uniformly accelerated motion Relative velocity CHAPTER 39 39 42 43 45 47 51 4 MOTION IN A PLANE 4. 1 4. 2 4. 3 4. 4 4. 5 IntroductionScalars and vectors Multiplication of vectors by real numbers Addition and subtraction of vectors – graphical method Resolution of vectors 65 65 67 67 69 CK xii 4. 6 4. 7 4. 8 4. 9 4. 10 4. 11 Vector addition – analytical method Motion in a plane Motion in a plane with constant acceleration Relative velocity in two dimensions Projectile motion Uniform circular motion CHAPTER 71 72 75 76 77 79 5 LAWS OF MOTION 5. 1 5. 2 5. 3 5. 4 5. 5 5. 6 5. 7 5. 8 5. 9 5. 10 5. 11 Introduction Aristotle’s fallacy The law of inertia Newton’s first law of motion Newton ’s second law of motion Newton’s third law of motion Conservation of momentumEquilibrium of a particle Common forces in mechanics Circular motion Solving problems in mechanics CHAPTER 89 90 90 91 93 96 98 99 100 104 105 6 WORK, ENERGY AND POWER 6. 1 6. 2 6. 3 6. 4 6. 5 6. 6 6. 7 6. 8 6. 9 6. 10 6. 11 6. 12 Introduction Notions of work and kinetic energy : The work-energy theorem Work Kinetic energy Work done by a variable force The work-energy theorem for a variable force The concept of potential energy The conservation of mechanical energy The potential energy of a spring Various forms of energy : the law of conservation of energy Power Collisions CHAPTER 114 116 116 117 118 119 120 121 123 126 28 129 7 SYSTEM OF PARTICLES AND ROTATIONAL MOTION 7. 1 7. 2 7. 3 7. 4 7. 5 7. 6 7. 7 7. 8 7. 9 7. 10 Introduction Centre of mass Motion of centre of mass Linear momentum of a system of particles Vector product of two vectors Angular velocity and its relation with linear veloci ty Torque and angular momentum Equilibrium of a rigid body Moment of inertia Theorems of perpendicular and parallel axes 141 144 148 149 150 152 154 158 163 164 CK xiii 7. 11 7. 12 7. 13 7. 14 Kinematics of rotational motion about a fixed axis Dynamics of rotational motion about a fixed axis Angular momentum in case of rotations about a fixed axisRolling motion CHAPTER 167 169 171 173 8 GRAVITATION 8. 1 8. 2 8. 3 8. 4 8. 5 8. 6 8. 7 8. 8 8. 9 8. 10 8. 11 8. 12 Introduction Kepler’s laws Universal law of gravitation The gravitational constant Acceleration due to gravity of the earth Acceleration due to gravity below and above the surface of earth Gravitational potential energy Escape speed Earth satellite Energy of an orbiting satellite Geostationary and polar satellites Weightlessness 183 184 185 189 189 190 191 193 194 195 196 197 APPENDICES 203 ANSWERS 219 CK CK CONTENTS FOREWORD PREFACE A NOTE FOR THE TEACHERS CHAPTER iii vii x 9 MECHANICAL PROPERTIES OF SOLIDS 9. 9. 2 9. 3 9. 4 9. 5 9. 6 9. 7 Introduction Elastic behaviour of solids Stress and strain Hooke’s law Stress-strain curve Elastic moduli Applications of elastic behaviour of materials CHAPTER 231 232 232 234 234 235 240 10 MECHANICAL PROPERTIES OF FLUIDS 10. 1 10. 2 10. 3 10. 4 10. 5 10. 6 10. 7 Introduction Pressure Streamline flow Bernoulli’s principle Viscosity Reynolds number Surface tension CHAPTER 246 246 253 254 258 260 261 11 THERMAL PROPERTIES OF MATTER 11. 1 11. 2 11. 3 11. 4 11. 5 11. 6 11. 7 11. 8 11. 9 11. 10 Introduction Temperature and heat Measurement of temperature Ideal-gas equation and absolute temperatureThermal expansion Specific heat capacity Calorimetry Change of state Heat transfer Newton’s law of cooling CHAPTER 274 274 275 275 276 280 281 282 286 290 12 THERMODYNAMICS 12. 1 12. 2 Introduction Thermal equilibrium 298 299 CK CK xii 12. 3 12. 4 12. 5 12. 6 12. 7 12. 8 12. 9 12. 10 12. 11 12. 12 12. 13 Zeroth law of thermodynamics Heat, internal ene rgy and work First law of thermodynamics Specific heat capacity Thermodynamic state variables and equation of state Thermodynamic processes Heat engines Refrigerators and heat pumps Second law of thermodynamics Reversible and irreversible processes Carnot engine CHAPTER 300 300 302 03 304 305 308 308 309 310 311 13 KINETIC THEORY 13. 1 13. 2 13. 3 13. 4 13. 5 13. 6 13. 7 Introduction Molecular nature of matter Behaviour of gases Kinetic theory of an ideal gas Law of equipartition of energy Specific heat capacity Mean free path CHAPTER 318 318 320 323 327 328 330 14 OSCILLATIONS 14. 1 14. 2 14. 3 14. 4 14. 5 14. 6 14. 7 14. 8 14. 9 14. 10 Introduction Periodic and oscilatory motions Simple harmonic motion Simple harmonic motion and uniform circular motion Velocity and acceleration in simple harmonic motion Force law for simple harmonic motion Energy in simple harmonic motion Some systems executing SHMDamped simple harmonic motion Forced oscillations and resonance CHAPTER 336 337 339 341 343 345 346 347 351 353 15 WAVES 15. 1 15. 2 15. 3 15. 4 15. 5 15. 6 Introduction Transverse and longitudinal waves Displacement relation in a progressive wave The speed of a travelling wave The principle of superposition of waves Reflection of waves 363 365 367 369 373 374 CK CK xiii 15. 7 15. 8 Beats Doppler effect 379 381 ANSWERS 391 BIBLIOGRAPHY 401 INDEX 403 CK CHAPTER ONE PHYSICAL WORLD 1. 1 WHAT IS PHYSICS ? 1. 1 What is physics ? 1. 2 Scope and excitement of physics 1. 3 Physics, technology and society 1. 4 Fundamental forces in nature 1. Nature of physical laws Summary Exercises Humans have always been curious about the world around them. The night sky with its bright celestial objects has fascinated humans since time immemorial. The regular repetitions of the day and night, the annual cycle of seasons, the eclipses, the tides, the volcanoes, the rainbow have always been a source of wonder. The world has an astonishing variety of materials and a bewildering diversity of life and behaviour. The inquiring and imaginative human mind has responded to the wonder and awe of nature in different ways. One kind of response from the earliest times has been to observe the hysical environment carefully, look for any meaningful patterns and relations in natural phenomena, and build and use new tools to interact with nature. This human endeavour led, in course of time, to modern science and technology. The word Science originates from the Latin verb Scientia meaning ‘to know’. The Sanskrit word Vijnan and the Arabic word Ilm c onvey similar meaning, namely ‘knowledge’. Science, in a broad sense, is as old as human species. The early civilisations of Egypt, India, China, Greece, Mesopotamia and many others made vital contributions to its progress. From the sixteenth century onwards, great strides were made n science in Europe. By the middle of the twentieth century, science had become a truly international enterprise, with many cultures and countries contributing to its rapid growth. What is Science and what is the so-called Scientific Method ? Science is a systematic attempt to understand natural phenomena in as much detail and depth as possible, and use the knowledge so gained to predict, modify and control phenomena. Science is exploring, experimenting and predicting from what we see around us. The curiosity to learn about the world, unravelling the secrets of nature is the first step towards the discovery of science.The scientific method involves several interconnected steps : Systematic observations, controlled experiments, qualitative and 2 quantitative reasoning, mathematical modelling, prediction and verification or falsification of theories. Speculation and conjecture also have a place in science; but ultimately, a scientific theory, to be acceptable, must be verified by relevant observations or experiments. There is much philosophical debate about the nature and method of science that we need not discuss here. The interplay of theory and observation (or experiment) is basic to the progress of science. Science is ever dynamic.There is no ‘final’ theory in science and no unquestioned authority among scientists. As observations improve in detail and precision or experiments yield new results, theories must account for them, if necessary, by introducing modifications. Sometimes the modifications may not be drastic and may lie within the framework of existing theory. For example, when Johannes Kepler (1571-1630) examined the extensive data on planetary motion collected by Tycho Brahe (1546-1601), the planetary circular orbits in heliocentric theory (sun at the centre of the solar system) imagined by Nicolas Copernicus (1473–1543) had to be replaced by elliptical rbits to fit the data better. Occasionally, however, the existing theory is simply unable to explain new observations. This causes a major upheaval in science. In the beginning of the twentieth century, it wa s realised that Newtonian mechanics, till then a very successful theory, could not explain some of the most basic features of atomic phenomena. Similarly, the then accepted wave picture of light failed to explain the photoelectric effect properly. This led to the development of a radically new theory (Quantum Mechanics) to deal with atomic and molecular phenomena. Just as a new experiment may suggest an lternative theoretical model, a theoretical advance may suggest what to look for in some experiments. The result of experiment of scattering of alpha particles by gold foil, in 1911 by Ernest Rutherford (1871–1937) established the nuclear model of the atom, which then became the basis of the quantum theory of hydrogen atom given in 1913 by Niels Bohr (1885–1962). On the other hand, the concept of antiparticle was first introduced theoretically by Paul Dirac (1902–1984) in 1930 and confirmed two years later by the experimental discovery of positron (antielectron) by Carl Anderson. P HYSICS Physics is a basic discipline in the category f Natural Sciences, which also includes other disciplines like Chemistry and Biology. The word Physics comes from a Greek word meaning nature. Its Sanskrit equivalent is Bhautiki that is used to refer to the study of the physical world. A precise definition of this discipline is neither possible nor necessary. We can broadly describe physics as a study of the basic laws of nature and their manifestation in different natural phenomena. The scope of physics is described briefly in the next section. Here we remark on two principal thrusts in physics : unification and reduction. In Physics, we attempt to explain diverse hysical phenomena in terms of a few concepts and laws. The effort is to see the physical world as manifestation of some universal laws in different domains and conditions. For example, the same law of gravitation (given by Newton) describes the fall of an apple to the ground, the motion of the moon around the earth and the motion of planets around the sun. Similarly, the basic laws of electromagnetism (Maxwell’s equations) govern all electric and magnetic phenomena. The attempts to unify fundamental forces of nature (section 1. 4) reflect this same quest for unification. A related effort is to derive the properties of a igger, more complex, system from the properties and interactions of its constituent simpler parts. This approach is called reductionism and is at the heart of physics. For example, the subject of thermodynamics, developed in the nineteenth century, deals with bulk systems in terms of macroscopic quantities such as temperature, internal energy, entropy, etc. Subsequently, the subjects of kinetic theory and statistical mechanics interpreted these quantities in terms of the properties of the molecular constituents of the bulk system. In particular, the temperature was seen to be related to the average kinetic energy of molecules of the system. . 2 SCOPE AND EXCITEMENT OF PHYSICS We can get some idea of the scope of physics by looking at its various sub-disciplines. Basically, there are two domains of interest : macroscopic and microscopic. The macroscopic domain includes phenomena at the laboratory, terrestrial and astronomical scales. The microscopic domain includes atomic, molecular and nuclear P HYSICAL WORLD phenomena*. Classical Physics deals mainly with macroscopic phenomena and includes subjects like Mechanics, Electrodynamics, Optics a nd T hermodynamics . Mechanics founded on Newton’s laws of motion and the law of gravitation is concerned with the motion (or quilibrium) of particles, rigid and deformable bodies, and general systems of particles. The propulsion of a rocket by a jet of ejecting gases, propagation of water waves or sound waves in air, the equilibrium of a bent rod under a load, etc. , are problems of mechanics. Electrodynamics deals with electric and magnetic phenomena associated with charged and magnetic bodies. Its basic laws were given by Coulomb, Oersted, Fig. 1. 1 chemical process, etc. , are problems of interest in thermodynamics. The microscopic domain of physics deals with the constitution and structure of matter at the minute scales of atoms and nuclei (and even ower scales of length) and their interaction with different probes such as electrons, photons and other elementary particles. Classical physics is inadequate to handle this domain and Quantum Theory is currently accepted as the proper framework for explaining microscopic phenomena. Overall, the edifice of physics is beautiful and imposing and you will appreciate it more as you pursue the subject. Theory and experiment go hand in hand in physics and help each other’s progress. The alpha scattering experiments of Rutherford gave the nuclear model of the atom. Ampere and Faraday, and encapsulated by Maxwell in his famous set of equations.The motion of a current-carrying conductor in a magnetic field, the respons e of a circuit to an ac voltage (signal), the working of an antenna, the propagation of radio waves in the ionosphere, etc. , are problems of electrodynamics. Optics deals with the phenomena involving light. The working of telescopes and microscopes, colours exhibited by thin films, etc. , are topics in optics. Thermodynamics, in contrast to mechanics, does not deal with the motion of bodies as a whole. Rather, it deals with systems in macroscopic equilibrium and is concerned with changes in internal energy, temperature, entropy, etc. , of the ystem through external work and transfer of heat. The efficiency of heat engines and refrigerators, the direction of a physical or * 3 You can now see that the scope of physics is truly vast. It covers a tremendous range of magnitude of physical quantities like length, mass, time, energy, etc. At one end, it studies phenomena at the very small scale of length -14 (10 m or even less) involving electrons, protons, etc. ; at the other end, it dea ls with astronomical phenomena at the scale of galaxies or even the entire universe whose extent is of the order of 26 10 m. The two length scales differ by a factor of 40 10 or even more.The range of time scales can be obtained by dividing the length scales by the –22 speed of light : 10 s to 1018 s. The range of masses goes from, say, 10–30 kg (mass of an 55 electron) to 10 kg (mass of known observable universe). Terrestrial phenomena lie somewhere in the middle of this range. Recently, the domain intermediate between the macroscopic and the microscopic (the so-called mesoscopic physics), dealing with a few tens or hundreds of atoms, has emerged as an exciting field of research. 4 Physics is exciting in many ways. To some people the excitement comes from the elegance and universality of its basic theories, from the fact that few basic concepts and laws can explain phenomena covering a large range of magnitude of physical quantities. To some others, the challenge in c arrying out imaginative new experiments to unlock the secrets of nature, to verify or refute theories, is thrilling. Applied physics is equally demanding. Application and exploitation of physical laws to make useful devices is the most interesting and exciting part and requires great ingenuity and persistence of effort. What lies behind the phenomenal progress of physics in the last few centuries? Great progress usually accompanies changes in our basic perceptions.First, it was realised that for scientific progress, only qualitative thinking, though no doubt important, is not enough. Quantitative measurement is central to the growth of science, especially physics, because the laws of nature happen to be expressible in precise mathematical equations. The second most important insight was that the basic laws of physics are universal — the same laws apply in widely different contexts. Lastly, the strategy of approximation turned out to be very successful. Most observed phenomena in daily life are rather complicated manifestations of the basic laws. Scientists recognised the importance f extracting the essential features of a phenomenon from its less significant aspects. It is not practical to take into account all the complexities of a phenomenon in one go. A good strategy is to focus first on the essential features, discover the basic principles and then introduce corrections to build a more refined theory of the phenomenon. For example, a stone and a feather dropped from the same height do not reach the ground at the same time. The reason is that the essential aspect of the phenomenon, namely free fall under gravity, is complicated by the presence of air resistance. To get the law of free all under gravity, it is better to create a situation wherein the air resistance is negligible. We can, for example, let the stone and the feather fall through a long evacuated tube. In that case, the two objects will fall almost at the same rate, giving the basic law t hat acceleration due to gravity is independent of the mass of the object. With the basic law thus found, we can go back to the feather, introduce corrections due to air resistance, modify the existing theory and try to build a more realistic P HYSICS Hypothesis, axioms and models One should not think that everything can be proved with physics and mathematics.All physics, and also mathematics, is based on assumptions, each of which is variously called a hypothesis or axiom or postulate, etc. For example, the universal law of gravitation proposed by Newton is an assumption or hypothesis, which he proposed out of his ingenuity. Before him, there were several observations, experiments and data, on the motion of planets around the sun, motion of the moon around the earth, pendulums, bodies falling towards the earth etc. Each of these required a separate explanation, which was more or less qualitative. What the universal law of gravitation says is that, if we assume that any two odies in the universe attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them, then we can explain all these observations in one stroke. It not only explains these phenomena, it also allows us to predict the results of future experiments. A hypothesis is a supposition without assuming that it is true. It would not be fair to ask anybody to prove the universal law of gravitation, because it cannot be proved. It can be verified and substantiated by experiments and observations. An axiom is a self-evident truth while a model s a theory proposed to explain observed phenomena. But you need not worry at this stage about the nuances in using these words. For example, next year you will learn about Bohr’s model of hydrogen atom, in which Bohr assumed that an electron in the hydrogen atom follows certain rules (postutates). Why did he do that? There was a large amount of spectroscopic data before him whic h no other theory could explain. So Bohr said that if we assume that an atom behaves in such a manner, we can explain all these things at once. Einstein’s special theory of relativity is also based on two postulates, the constancy of the speed f electromagnetic radiation and the validity of physical laws in all inertial frame of reference. It would not be wise to ask somebody to prove that the speed of light in vacuum is constant, independent of the source or observer. In mathematics too, we need axioms and hypotheses at every stage. Euclid’s statement that parallel lines never meet, is a hypothesis. This means that if we assume this statement, we can explain several properties of straight lines and two or three dimensional figures made out of them. But if you don’t assume it, you are free to use a different axiom and get a new geometry, as has indeed happened in he past few centuries and decades. P HYSICAL WORLD 5 theory of objects falling to the earth under gr avity. 1. 3 PHYSICS, TECHNOLOGY AND SOCIETY The connection between physics, technology and society can be seen in many examples. The discipline of thermodynamics arose from the need to understand and improve the working of heat engines. The steam engine, as we know, is inseparable from the Industrial Revolution in England in the eighteenth century, which had great impact on the course of human civilisation. Sometimes technology gives rise to new physics; at other times physics generates new technology.An example of the latter is the wireless communication technology that followed the discovery of the basic laws of electricity and magnetism in the nineteenth century. The applications of physics are not always easy to foresee. As late as 1933, the great physicist Ernest Rutherford had dismissed the possibility of tapping energy from atoms. But only a few years later, in 1938, Hahn and Meitner discovered the phenomenon of neutron-induced fission of uranium, which would serve as the bas is of nuclear power reactors and nuclear weapons. Yet another important example of physics giving rise to technology is the silicon chip’ that triggered the computer revolution in the last three decades of the twentieth century. A most significant area to which physics has and will contribute is the development of alternative energy resources. The fossil fuels of the planet are dwindling fast and there is an urgent need to discover new and affordable sources of energy. Considerable progress has already been made in this direction (for example, in conversion of solar energy, geothermal energy, etc. , into electricity), but much more is still to be accomplished. Table1. 1 lists some of the great physicists, their major contribution and the country of rigin. You will appreciate from this table the multi-cultural, international character of the scientific endeavour. Table 1. 2 lists some important technologies and the principles of physics they are based on. Obviously, these tabl es are not exhaustive. We urge you to try to add many names and items to these tables with the help of your teachers, good books and websites on science. You will find that this exercise is very educative and also great fun. And, assuredly, it will never end. The progress of science is unstoppable! Physics is the study of nature and natural phenomena. Physicists try to discover the rules hat are operating in nature, on the basis of observations, experimentation and analysis. Physics deals with certain basic rules/laws governing the natural world. What is the nature Table 1. 1 Some physicists from different countries of the world and their major contributions Name Major contribution/discovery Country of Origin Archimedes Principle of buoyancy; Principle of the lever Greece Galileo Galilei Law of inertia Italy Christiaan Huygens Wave theory of light Holland Isaac Newton Universal law of gravitation; Laws of motion; Reflecting telescope U. K. Michael Faraday Laws of electromagnetic ind uction U. K. James Clerk MaxwellElectromagnetic theory; Light-an electromagnetic wave U. K. Heinrich Rudolf Hertz Generation of electromagnetic waves Germany J. C. Bose Ultra short radio waves India W. K. Roentgen X-rays Germany J. J. Thomson Electron U. K. Marie Sklodowska Curie Discovery of radium and polonium; Studies on Poland natural radioactivity Albert Einstein Explanation of photoelectric effect; Theory of relativity Germany 6 P HYSICS Name Major contribution/discovery Country of Origin Victor Francis Hess Cosmic radiation Austria R. A. Millikan Measurement of electronic charge U. S. A. Ernest Rutherford Nuclear model of atom New Zealand Niels BohrQuantum model of hydrogen atom Denmark C. V. Raman Inelastic scattering of light by molecules India Louis Victor de Borglie Wave nature of matter France M. N. Saha Thermal ionisation India S. N. Bose Quantum statistics India Wolfgang Pauli Exclusion principle Austria Enrico Fermi Controlled nuclear fission Italy Werner Heisenberg Q uantum mechanics; Uncertainty principle Germany Paul Dirac Relativistic theory of electron; Quantum statistics U. K. Edwin Hubble Expanding universe U. S. A. Ernest Orlando Lawrence Cyclotron U. S. A. James Chadwick Neutron U. K. Hideki Yukawa Theory of nuclear forces Japan Homi Jehangir BhabhaCascade process of cosmic radiation India Lev Davidovich Landau Theory of condensed matter; Liquid helium Russia S. Chandrasekhar Chandrasekhar limit, structure and evolution of stars India John Bardeen Transistors; Theory of super conductivity U. S. A. C. H. Townes Maser; Laser U. S. A. Abdus Salam Unification of weak and electromagnetic interactions Pakistan of physical laws? We shall now discuss the nature of fundamental forces and the laws that govern the diverse phenomena of the physical world. 1. 4 FUNDAMENTAL FORCES IN NATURE* We all have an intuitive notion of force. In our experience, force is needed to push, carry or hrow objects, deform or break them. We also experience the impact o f forces on us, like when a moving object hits us or we are in a merry-goround. Going from this intuitive notion to the proper scientific concept of force is not a trivial matter. Early thinkers like Aristotle had wrong * ideas about it. The correct notion of force was arrived at by Isaac Newton in his famous laws of motion. He also gave an explicit form for the force for gravitational attraction between two bodies. We shall learn these matters in subsequent chapters. In the macroscopic world, besides the gravitational force, we encounter several kinds f forces: muscular force, contact forces between bodies, friction (which is also a contact force parallel to the surfaces in contact), the forces exerted by compressed or elongated springs and taut strings and ropes (tension), the force of buoyancy and viscous force when solids are in Sections 1. 4 and 1. 5 contain several ideas that you may not grasp fully in your first reading. However, we advise you to read them carefully to develo p a feel for some basic aspects of physics. These are some of the areas which continue to occupy the physicists today. P HYSICAL WORLD 7 Table 1. 2 Link between technology and physics TechnologyScientific principle(s) Steam engine Laws of thermodynamics Nuclear reactor Controlled nuclear fission Radio and Television Generation, propagation and detection of electromagnetic waves Computers Digital logic Lasers Light amplification by stimulated emission of radiation Production of ultra high magnetic fields Superconductivity Rocket propulsion Newton’s laws of motion Electric generator Faraday’s laws of electromagnetic induction Hydroelectric power Conversion of gravitational potential energy into electrical energy Aeroplane Bernoulli’s principle in fluid dynamics Particle accelerators Motion of charged particles in electromagnetic ields Sonar Reflection of ultrasonic waves Optical fibres Total internal reflection of light Non-reflecting coatings Thin film optical in terference Electron microscope Wave nature of electrons Photocell Photoelectric effect Fusion test reactor (Tokamak) Magnetic confinement of plasma Giant Metrewave Radio Telescope (GMRT) Detection of cosmic radio waves Bose-Einstein condensate Trapping and cooling of atoms by laser beams and magnetic fields. contact with fluids, the force due to pressure of a fluid, the force due to surface tension of a liquid, and so on. There are also forces involving charged nd magnetic bodies. In the microscopic domain again, we have electric and magnetic forces, nuclear forces involving protons and neutrons, interatomic and intermolecular forces, etc. We shall get familiar with some of these forces in later parts of this course. A great insight of the twentieth century physics is that these different forces occurring in different contexts actually arise from only a small number of fundamental forces in nature. For example, the elastic spring force arises due to the net attraction/repulsion betw een the neighbouring atoms of the spring when the spring is elongated/compressed. This net ttraction/repulsion can be traced to the (unbalanced) sum of electric forces between the charged constituents of the atoms. In principle, this means that the laws for ‘derived’ forces (such as spring force, friction) are not independent of the laws of fundamental forces in nature. The origin of these derived forces is, however, very complex. At the present stage of our understanding, we know of four fundamental forces in nature, which are described in brief here : 8 P HYSICS Albert Einstein (1879-1955) Albert Einstein, born in Ulm, Germany in 1879, is universally regarded as one of the greatest physicists of all time.His astonishing scientific career began with the publication of three path-breaking papers in 1905. In the first paper, he introduced the notion of light quanta (now called photons) and used it to explain the features of photoelectric effect that the classical wave th eory of radiation could not account for. In the second paper, he developed a theory of Brownian motion that was confirmed experimentally a few years later and provided a convincing evidence of the atomic picture of matter. The third paper gave birth to the special theory of relativity that made Einstein a legend in his own life time.In the next decade, he explored the consequences of his new theory which included, among other things, the mass-energy equivalence enshrined in his famous equation E = mc2. He also created the general version of relativity (The General Theory of Relativity), which is the modern theory of gravitation. Some of Einstein’s most significant later contributions are: the notion of stimulated emission introduced in an alternative derivation of Planck’s blackbody radiation law, static model of the universe which started modern cosmology, quantum statistics of a gas of massive bosons, and a critical analysis of the foundations of quantum mechanics.Th e year 2005 was declared as International Year of Physics, in recognition of Einstein’s monumental contribution to physics, in year 1905, describing revolutionary scientific ideas that have since influenced all of modern physics. 1. 4. 1 Gravitational Force The gravitational force is the force of mutual attraction between any two objects by virtue of their masses. It is a universal force. Every object experiences this force due to every other object in the universe. All objects on the earth, for example, experience the force of gravity due to the earth. In particular, gravity governs the motion of the moon and artificial satellites around he earth, motion of the earth and planets around the sun, and, of course, the motion of bodies falling to the earth. It plays a key role in the large-scale phenomena of the universe, such as formation and evolution of stars, galaxies and galactic clusters. 1. 4. 2 Electromagnetic Force Electromagnetic force is the force between charged parti cles. In the simpler case when charges are at rest, the force is given by Coulomb’s law : attractive for unlike charges and repulsive for like charges. Charges in motion produce magnetic effects and a magnetic field gives rise to a force on a moving charge. Electric nd magnetic effects are, in general, inseparable – hence the name electromagnetic force. Like the gravitational force, electromagnetic force acts over large distances and does not need any intervening medium. It is enormously strong compared to gravity. The electric force between two protons, for example, 36 is 10 times the gravitational force between them, for any fixed distance. Matter, as we know, consists of elementary charged constituents like electrons and protons. Since the electromagnetic force is so much stronger than the gravitational force, it dominates all phenomena at atomic and molecular scales. (The other two forces, as we hall see, operate only at nuclear scales. ) Thus it is mainly the elec tromagnetic force that governs the structure of atoms and molecules, the dynamics of chemical reactions and the mechanical, thermal and other properties of materials. It underlies the macroscopic forces like ‘tension’, ‘friction’, ‘normal force’, ‘spring force’, etc. Gravity is always attractive, while electromagnetic force can be attractive or repulsive. Another way of putting it is that mass comes only in one variety (there is no negative mass), but charge comes in two varieties : positive and negative charge. This is what makes all the difference.Matter is mostly electrically neutral (net charge is zero). Thus, electric force is largely zero and gravitational force dominates terrestrial phenomena. Electric force manifests itself in atmosphere where the atoms are ionised and that leads to lightning. P HYSICAL WORLD 9 Satyendranath Bose (1894-1974) Satyendranath Bose, born in Calcutta in 1894, is among the great Indian physicists who made a fundamental contribution to the advance of science in the twentieth century. An outstanding student throughout, Bose started his career in 1916 as a lecturer in physics in Calcutta University; five years later he joined Dacca University.Here in 1924, in a brilliant flash of insight, Bose gave a new derivation of Planck’s law, treating radiation as a gas of photons and employing new statistical methods of counting of photon states. He wrote a short paper on the subject and sent it to Einstein who immediately recognised its great significance, translated it in German and forwarded it for publication. Einstein then applied the same method to a gas of molecules. The key new conceptual ingredient in Bose’s work was that the particles were regarded as indistinguishable, a radical departure from the assumption that underlies the classical MaxwellBoltzmann statistics.It was soon realised that the new Bose-Einstein statistics was applicable to particles with integers spins, and a new quantum statistics (Fermi-Dirac statistics) was needed for particles with half integers spins satisfying Pauli’s exclusion principle. Particles with integers spins are now known as bosons in honour of Bose. An important consequence of Bose-Einstein statistics is that a gas of molecules below a certain temperature will undergo a phase transition to a state where a large fraction of atoms populate the same lowest energy state.Some seventy years were to pass before the pioneering ideas of Bose, developed further by Einstein, were dramatically confirmed in the observation of a new state of matter in a dilute gas of ultra cold alkali atoms – the Bose-Eintein condensate. If we reflect a little, the enormous strength of the electromagnetic force compared to gravity is evident in our daily life. When we hold a book in our hand, we are balancing the gravitational force on the book due to the huge mass of the earth by the ‘normal force’ provided by our hand. The latter is nothing but the net electromagnetic force between the charged constituents of our hand and he book, at the surface in contact. If electromagnetic force were not intrinsically so much stronger than gravity, the hand of the strongest man would crumble under the weight of a feather ! Indeed, to be consistent, in that circumstance, we ourselves would crumble under our own weight ! 1. 4. 3 Strong Nuclear Force The strong nuclear force binds protons and neutrons in a nucleus. It is evident that without some attractive force, a nucleus will be unstable due to the electric repulsion between its protons. This attractive force cannot be gravitational since force of gravity is negligible compared to the electric force.A new basic force must, therefore, be invoked. The strong nuclear force is the strongest of all fundamental forces, about 100 times the electromagnetic force in strength. It is charge-independent and acts equally between a proton and a proton, a neutron a nd a neutron, and a proton and a neutron. Its range is, however, extremely small, –15 of about nuclear dimensions (10 m). It is responsible for the stability of nuclei. The electron, it must be noted, does not experience this force. Recent developments have, however, indicated that protons and neutrons are built out of still more elementary constituents called quarks. . 4. 4 Weak Nuclear Force The weak nuclear force appears only in certain nuclear processes such as the ? -decay of a nucleus. In ? -decay, the nucleus emits an electron and an uncharged particle called neutrino. The weak nuclear force is not as weak as the gravitational force, but much weaker than the strong nuclear and electromagnetic forces. The range of weak nuclear force is exceedingly small, of the order of 10-16 m. 1. 4. 5 Towards Unification of Forces We remarked in section 1. 1 that unification is a basic quest in physics. Great advances in physics often amount to unification of different 10 P HYSICS Tab le 1. Fundamental forces of nature Name Relative strength Range Operates among Gravitational force 10 –39 Infinite All objects in the universe Weak nuclear force 10–13 Very short, Sub-nuclear size ( ? –16 m) 10 Some elementary particles, particularly electron and neutrino Electromagnetic force 10–2 Infinite Charged particles Strong nuclear force 1 Short, nuclear size ( ? –15 m) 10 Nucleons, heavier elementary particles theories and domains. Newton unified terrestrial and celestial domains under a common law of gravitation. The experimental discoveries of Oersted and Faraday showed that electric and magnetic phenomena are in general nseparable. Maxwell unified electromagnetism and optics with the discovery that light is an electromagnetic wave. Einstein attempted to unify gravity and electromagnetism but could not succeed in this venture. But this did not deter physicists from zealously pursuing the goal of unification of forces. Recent decades have seen much progress on this front. The electromagnetic and the weak nuclear force have now been unified and are seen as aspects of a single ‘electro-weak’ force. What this unification actually means cannot be explained here. Attempts have been (and are being) made to unify the electro-weak and the trong force and even to unify the gravitational force with the rest of the fundamental forces. Many of these ideas are still speculative and inconclusive. Table 1. 4 summarises some of the milestones in the progress towards unification of forces in nature. 1. 5 NATURE OF PHYSICAL LAWS Physicists explore the universe. Their investigations, based on scientific processes, range from particles that are smaller than atoms in size to stars that are very far away. In addition to finding the facts by observation and experimentation, physicists attempt to discover the laws that summarise (often as mathematical quations) these facts. In any physical phenomenon governed by different forc es, several quantities may change with time. A remarkable fact is that some special physical quantities, however, remain constant in time. They are the conserved quantities of nature. Understanding these conservation principles is very important to describe the observed phenomena quantitatively. For motion under an external conservative force, the total mechanical energy i. e. the sum of kinetic and potential energy of a body is a constant. The familiar example is the free fall of an object under gravity. Both the kinetic energy