Potential energy free essay sample

When a sphere moves through a fluid slowly, it usually experiences a drag force. This force is determined by the radius of the sphere r, the speed of the sphere v, and the viscosity of the fluid ? (in the unit of [kg/(m†¢s)]). Using dimensional analysis, determine how the force depends on these factors. 2. Three vectors A, B, and C add together to yield zero: A + B + C = 0. The vectors A and C point in opposite directions and their magnitudes are related by the expression: A = 2C. Which one of the following conclusions is correct? a) b) c) d) e) A and B have equal magnitudes and point in opposite directions. B and C have equal magnitudes and point in the same direction. B and C have equal magnitudes and point in opposite directions. A and B point in the same direction, but A has twice the magnitude of B. We will write a custom essay sample on Potential energy or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page B and C point in the same direction, but C has twice the magnitude of B. B 6. 4 m 5. 4 m 3. A toolbox is carried from the base of a ladder at point A to a scaffold 5. 0 m above the ground at point B as shown in the figure. What is the magnitude of the displacement of the toolbox in its movement from point A to point B? a) b) c) d) e) 15 m 19 m 8. 1 m 11 m 13 m 7. 6 m 6. 6 m A 4. Given mass m, height h, gravitational acceleration constant g, time t, which one of the following is a dimensionless parameter? a) mg/ht b) h/gt c) h/gt2 d) mh/gt2 e) mh/gt 5. A ball hangs from a string attached to the ceiling. What is the net force acting on the ball? a) The net force is downward. b) The net force is upward. c) The net force is zero. 6. You put your book on the bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. In the reference frame of the ground, which of the following is correct? a) b) c) d) e) A net force acted on it. No net force acted on it. It remained at rest. It did not move, but only seemed to. Gravity briefly stopped acting on it. 7. Consider a cart on a horizontal frictionless table. Once the cart has been given a push in the x-direction and released, what will happen to the cart? a) b) c) d) e) It slowly comes to a stop. It continues with constant acceleration. It continues with decreasing acceleration. It continues with constant velocity. It immediately comes to a stop. 8. Off to the Races: F v From rest, we step on the gas of our Ferrari, providing a force F for 4s, speeding it up to a final speed v. If the applied force were only 1/2 F, how long would it have to be applied to reach the same final speed? a) 16s b) 8s c) 4s d) 2s e) 1s 9. Two blocks of the same mass are connected by a string and are pulled across a frictionless surface by a constant force. Will the two blocks move with constant velocity? a) Yes, both blocks move with constant velocity. b) No, both blocks move with constant acceleration. ) The two blocks will have different velocities and/or accelerations. 10. Referring to figure in Q9, will the tension in the connecting string be greater than, less than, or equal to the force F ? a) Greater than. b) Less than. c) Equal to. 11. Force and Two Masses: F m1 a1 a2 = 2a1 F m2 F m2 m1 a3 A force F acts on mass m1 giving acceleration a1. The same force acts on a different mass m2 giving acceleration a2 = 2a1. If m1 and m2 are glued together and the same force F acts on this combination, what is the resulting acceleration? a) 3/4 a1 b) 3/2 a1 c) 1/2 a1 d) 4/3 a1 e) 2/3 a1 12. Bowling vs. Ping-Pong I: F12 F21 In outer space, a bowling ball and a ping-pong ball attract each other due to gravitational forces. How do the magnitudes of these attractive forces compare? a) b) c) d) e) The bowling ball exerts a greater force on the ping-pong ball. The ping-pong ball exerts a greater force on the bowling ball. The forces are equal in magnitude. The forces are zero because they cancel out. There are actually no forces at all. 13. Bowling vs. Ping-Pong II: In outer space, gravitational forces exerted by a bowling ball and a ping-pong ball on each other are equal and opposite. How do their accelerations compare? a) b) c) d) e) They do not accelerate because they are weightless. Accelerations are equal, but not opposite. Accelerations are opposite, but bigger for the bowling ball. Accelerations are opposite, but bigger for the ping-pong ball. Accelerations are equal and opposite. 14. A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension? T v a) Tension does no work at all. b) Tension does negative work. c) Tension does positive work. 15. You lift a book with your hand in such a way that it moves up at constant speed. While it is moving, what is the total work done on the book? ?r FHAND v = const a=0 mg a) b) c) d) e) mg ? ?r FHAND ? ?r (FHAND + mg) ? ?r Zero None of the above. 16. Two paths lead to the top of a big hill. One is steep and direct, while the other is twice as long but less steep. How much more potential energy would you gain if you take the longer path? a) b) c) d) e) The same as the short path. Twice as much. Four times as much. Half as much. No PE gained in either case. 17. A hole is drilled through the center of Earth and emerges on the other side. You jump into the hole. What will happen to you? Hint: Inside earth, when you are at a distance r away from the center, the gravitational force on you is just the force due to your body mass and the earth mass of sphere of radius r from the center. ) a) b) c) d) You fall to the center and stop. You go all the way through and continue off into space. You fall to the other side of Earth and then return. You won’t fall at all. 18. A proton and an electron are held apart a distance of 1 m and then released. As they approach each other, what will happen to the force between them? a) It gets bigger. b) It gets smaller. c) It stays the same. 19. Continuing from Q18, which particle has the larger acceleration at any time? a) Proton. b) Electron. c) Both the same. 20. Continuing from Q19, where would they meet? a) In the middle. b) Closer to the electron’s side. c) Closer to the proton’s side. 21. Considering a vibrating pendulum as shown in the figure. i) At which of the above time is the kinetic energy a maximum? ii) At which of the above time is the potential energy a maximum? iii) At which of the above time is kinetic energy being transformed to potential energy? iv) At which of the above time is potential energy being transformed to kinetic energy?

Digital Video vs Film essays

Digital Video vs Film essays What do you do, when you are a budding filmmaker and you finally get the film you simply have to make, but your wallet simply cannot afford the expense? Filmmaking has, up until now, forever been a luxury for the rich or those in the business. With the advent of portable consumer video cameras in the early 1960s, many a budding filmmaker was hit with a new tool that they could build their dreams upon. But it didn't always end up like that. You get your camera home, you set it up, you get tapes, you get spare batteries and you are ready to start shooting. You finish your shoot, much to the pleasure of all involved, and you are left with tapes of footage all mixed and jumbled around into no real discernable order. How do you go about editing it? You don't, unless, like before, you have a lot of money or you are in the business. So the home consumer was stuck with hours and hours of footage, but nothing to edit it down, for the gear simply cost too much; at times double the initial cost of the camera. The early 1990s saw the advent of digital cameras. Doors suddenly opened and the world was greeted with seemingly endless boundaries (in fact you are only bound by the available storage space you have). Digital filmmaking has evolved to a level where now, with a PC and a camera, you can be come the world's next Steven Spielberg or if you prefer, Quentin Tarantino. Sure, everyone wants to shoot on 35mm, but not everyone has the millions of dollars for the equipment (the film itself costs more than the average 35mm camera). This is why digital video (DV) has become such an appealing option. It's a format that looks great on it's own, looks great with effects and even looks good when blown up to imitate real 35mm film. Before we get too carried away, you can't just pick up a DV camera and expect the result to be a newGodfather? orBraveheart?; you do need a great idea. Many films have actually garnered more success and critical ...

Research paper Example | Topics and Well Written Essays - 2500 words - 15

Research Paper Example This is born out by the tremendous gains that Roman civilization made during his reign, even though much of it came on the heels of a dictatorial style of leadership (Barret, p. 608). This paper will demonstrate the historical relevancy of Julius Caesar, his accomplishments, and the lessons to be learned from ancient civilization and culture. Even from an early age, Caesar was extreme popular within Rome. In addition, he developed a political acumen that would serve him well for his entire career, and garner the support he needed to push Rome into a new era of modernity for the time. One of his primary contributions to the growth of the Roman Empire rests in his ability to expand the regions that Rome had influence over, in addition to establishing more of an imperial type of system. These concepts would serve as the model for territorial expansion throughout much of the world for much of the next millennium. It is important to note that Caesar was not always a person of privilege. While he was born into a family of aristocrats from Rome, history tells us that his family was of relatively minimal means. The father of Julius Caesar actually died when Caesar was only 16 years old, and he remained very close to his mother. As a result of his relatively poor upbringing, however, Cesar spent much of his youth in unstable surroundings. He would remark later in life that even Rome contributed his own sense of instability, as the country was truly is a relative state of constant disorder, even though it was already of enormous stature within the region. Roman had begun to discredit their own nobility, and they were not focused enough on territorial expansion to truly be able to deal with it enormous size and influence throughout the ancient world. In essence, this reveals a truth that we realize even today. The larger a country grows, the more organization and focus is required to drive future

Personal Narrative 2 Essay-My Story Essay Example | Topics and Well Written Essays - 1250 words

Personal Narrative 2 -My Story - Essay Example In the deepest recesses of my heart I believed that my infant was going to a good home. On the day of his birth, I summoned all the strength I could muster to resist the urge to hold my precious baby boy and to meet the new parents. Beyond a shadow of a doubt it would have been too hard for me if there was any contact. For this reason, even though I so badly wanted to say, â€Å"I love you† and to kiss him goodbye I let him disappear from my life with only the barest glance. The trauma of the pregnancy and the rigor of the decision-making left me with several health issues as a result I was in the hospital for one week after the delivery. On the seventh day a phone call came from the courthouse. In order to finalize the adoption my presence was needed. Perhaps this was the test of my mantle- the day was so hard and emotional for me and my mom, I distinctly remember my body shaking. The shaking was extremely uncontrollable to the point that I could not even sign my name to the papers. Nonetheless, the judge appeared to understand my plight. He advised me to take my time. Signing that piece of paper was worse than all the labor pain endured during birth. My mom and I walked out of the judge’s chamber; I looked at her to see tears roll down her face. It broke my heart to see her cry. Year after year would pass by. Without fail, during the week of July 10th I would find myself overwhelmed with depression. On that day I would look up in the sky and whimper, â€Å"Happy birthday my baby boy.† As I grew older I would wonder whether my offspring ever thought about me, whether he would ever try to find and if he did find me would he forgive me. From time to time my family and friends would ask me if I would like to find him. My answer has always been a resounding, â€Å"YES!† However, I would silently speculate about the potential nature of his attitude towards me - would he reject me or would he be thankful that he was never part of my life. My speculation always ended in the same manner- let sleeping dogs lie it would be best that he try to find me when he is ready. In 1998 I gave birth to a beautiful girl, Alexandria Louise. She was the joy of my life. It was simply delightful to know that I could keep her forever. Nevertheless, there was still emptiness, a yearning in my heart for my baby boy that I had given up seventeen years earlier. I married Alexandria’s father, Poncho Rugg, in 2008. The marriage marked another exciting milestone in my journey of life. My husband was thrilled but sad to hear the story about my son. Constantly, he would ask me if I was ready to start the search and consistently, my reply would be no. I always believed that the time was not right and that one day he will look for me but only when the time was right. My personal information was everywhere in cyberspace. I believe that he had an abundance of opportunity to search for me if he was interested. I resigned myself to the hope of him searching for me and finding me one day. It was December 15, 2009. Every Tuesday night was pool night at Paco’s. On this particular Tuesday, my husband decided to accompany me to watch and have a birthday drink with me given that the next day was my birthday. It was my turn to shoot. I was nervous because I was shooting against a top player on the opposite team. I would look at Poncho from time to time and smile. On one occasion, I turned to him but he was on his cell phone. Not

Police Influence on Society Essay Example for Free

Police Influence on Society Essay Historically, this nation of the United States has proven many times over its dominance over those who are different to those in power. The United States has proven time and again that it can and will discriminate against others it considers less than equal. This is proven and demonstrated to all U. S citizens and those who are not, in our history books throughout school. Every year affording student’s new information of how the United States demonstrates its power over those that are different. From the demise of many Native American tribes; the internment of Japanese Americans after Pearl Harbor; the discrimination and segregation of African Americans; to the constant current discrimination to those people of different origins, whose language and customs differ from that of the status quo. The United States; although, has demonstrated preference to what is referred to as â€Å"White privilege† has consistently demonstrated countless efforts and successes against prejudice and discrimination that have led this country to focus continually on equality and justice for all. The dominant group is the group in power and so by definition is the group that establishes control. In order for a nation, such as the United States, to establish a dominance that will encourage all people to follow suit, the key lies in establishing a common ground. Control in itself is a trait that no one wants as a descriptor, but as a way to describe a united front it is more than acceptable. Having control over a population through laws and regulations that the people themselves agree to is control through the general consent. Laws and regulations meant to establish order and protection to its people also establish control within the government that governs over the people. Policing is a primary way for the government to serve and protect its people as well as its own interests. Policing serves many purposes but the primary purpose is to protect. But, who do the police protect? The wealthy have an economic position that frees them from the need to commit crimes such as theft, while the poor live in economic despair that tempts them to commit these crimes, or so it is believed. In reality, no one is exempt of crime; anyone is capable of committing crimes and need is not always the deciding factor. Those fortunate of economic wealth also enjoy the privilege of a high social status, and those of high social status do not need nor do they commit crimes. A myth, of course, but still believed by many. On the other hand, the less fortunate suffer discrimination based on their poor economic status among other factors. â€Å"Minorities experience unequal treatment and have less power over their lives than members of a dominant group† (Robert McNamara, 2009). To understand how discrimination has changed throughout the years, it is important to understand the gradual but never ending influx of people from different countries into American soil. The concept of discrimination is fairly odd considering all people within the United States with the exception of Native Americans are all immigrants to this great nation and yet generation after generation people continually do to new cultures that which was once experienced by them and is possibly still experienced by their race or ethnic group. People that have lived within the United States eventually gain a sense of â€Å"national identity† and â€Å"identify with being part of the larger society† (Robert McNamara, 2009). With so many different people coming in to the country they not only bring everything which is good about their culture but also that which is negative and affects the U.S as a whole. Discrimination is not based solely on a different culture; race, etc. but rather the negative aspects endured by the American public by a few anti-social individuals that bring disgrace upon a certain group. The events occurring on September 11th were not the actions of all Arabs or Muslims, but rather of a few and because of them all that resemble those who attacked have become the target of discrimination. Because of the actions of certain individuals, the groups that they belong to or are associated with tend to be at the receiving end of discrimination to the point that law enforcement finds it necessary to profile in order to perform their duties (Bass, 2001). Policing in the United States reflects discriminatory actions much like many other countries. The race or ethnic background in American history, when it refers to discrimination is not relative because discrimination is not limited to certain groups. Discrimination is an act that affects those that are different from the dominant population. Law enforcement discriminates not because someone is from a different race or because a race or ethnic group commits a certain amount or types of crime. Discrimination in its purest form is simply â€Å"White America† unwilling to accept difference and those with â€Å"national identity† forgetting their own history. References Bass, S. (2001). Policing space, policing race: Social control imperatives and police discretionary decisions. Social Justice, 28(1), 156-176. Retrieved from http://search.proquest.com/docview/231906243?accountid=458 Chan, J. (2011). Racial Profiling and Police Subculture. Canadian Journal Of Criminology Criminal Justice, 53(1), 75-78. MacNamara, R. H., Burns, R. (2009). Multiculturalism in the criminal justice system. New York, NY: McGraw-Hill. The Criminology and Criminal Justice Collective of Northern Arizona University. (2009). Investigating difference: Human and cultural relations in criminal justice (2nd ed.). Upper Saddle River, NJ: Prentice Hall.

Global Broadcasting Systems :: essays research papers

This book is about the global broadcasting systems. The Preface says that things are changing so fast that the book will probably be outdated by the time we read it. On the other hand, it does provide a clear picture of television and other media around the world, at the moment in time when the authors did their research. The writers got help from their colleagues, as well as questions and comments by students, in order to put the book together in its final form. It has seven chapters, a Glossary, a list of Further Reading, and an index. Each chapter discusses one aspect of global broadcasting. Chapter One is titled "The World Telecommunications Revolution." The empowerment of consumers is changing the way global telecommunications works, even though this is not the aim of the media distributors. Many professionals in the field "believe that the future is a multimedia retrieval system for everyone" (p. 1). World communications systems can make it possible to get any almost television show in the world, from almost anywhere in the world. Different cultures might require different types of programming around the world. On the other hand, shows like CNN have made the formats of programs uniform around the world. Will we have diversity, or uniformity, in the future? Chapter Two is titled "World Systems Overview." There are hundreds of millions of television sets and radios all over the world. Countries like the US, Canada, and England have sophisticated broadcast systems. Developing countries like those in Central and South America do not. Some countries have private broadcasters, and others have government broadcasters. Some countries have a mix of both private and government ownership. Chapter Three is titled "Control and Regulation of World Systems." The variety of control, from complete government control of broadcasting systems to total privatization of ownership, depends on the form of government in each country. The US has private ownership, but the Federal Communications Commission (FCC) regulates broadcasting. Canada has government broadcasting by the Canadian Broadcasting Company (CBC), but they also have private ownership because they want diversity in programming. In Cuba the government has control over all stations. Chapter Four is titled "Financing Global Electronic Media." The source of funds for broadcasting could be government subsidy, private advertising, or donations by the viewing public. Most of the broadcasting in the US is supported by advertising. The Canadian government supports the CBC because they believe that it is important for the growth of national culture and education.

My writing ritual

The writing process Is new to me since Vie been out of school for 2 plus years. I am a new writer thus I am learning new writing techniques that produces a more unique personalized writing for me. The new technique I have learned Is writing rituals which are a detailed act or series of acts carried out by an Individual to relieve anxiety or to forestall the development of anxiety. Also (psycho) any repetitive behavior, such as hand-washing, performed by a person with a compulsive personality disorder.These steps will explain its self and it'll show how it can also be plied to your everyday life. The rituals I use help to relieve stress when writing and is very important doing so. Although the steps I take are very tedious and well- structured, I put myself in a mind to produce well papers that represent not only me as a student but as a creative mouth piece generating an art. In order to succeed with a well-grounded paper I use these steps that I will explain in detail in following p ages. Introduction As for me to begin my process to write, I prepare my mind, body, and soul.Whether, for homework, a speech, guidelines, or announcements, I have to prepare yeses or I won't be able to focus and be easily distracted. I've noticed my preparations have made my writing extremely successful. These steps will explain it and it'll show how it can also be applied to your everyday life. Step by Step Beginning my days at 6 A. M. Get dressed, brush my teeth and wash my face. Then, I go downstairs to make coffee. I like everything to be clean and organized so I clean the kitchen, put all the clean dishes away (from the day before) and fix the couch.I make my coffee and go back upstairs. I play Soft Charlatans music to set the atmosphere. So I'm not so tense while I'm writing, I use the yoga ball to stretch my muscles. Then, I set up my computer, take out my notes that Ill need, and look at the assignments that are due. If I get overwhelmed, I like to go for a walk and think ab out the assignment. I ask myself how I can complete it successfully, have I ever done this type of assignment before, and can it be applied to reality? I also do research to further my understanding and to make sure I have the right ideas for the assignment.Before I get started, I like to get a cold glass of water, some fruit, rackets, or peanuts so I wont lose my focus. Think of this as food for thought! And these are my steps to succeed. With the writing rituals I listed above show what I use to create assignments and how important they are to me producing a well-organized paper. I like to succeed; I take my education very seriously so this exercise has shown me that I'm going down the right path. During this course, Vie learned in order to succeed; I have to take extra steps to accomplish my goals. I think this course has helped me improve in all aspects of my life.