The effect of temperature on a squash ball Essay Example

The effect of temperature on a squash ball Paper I did a preliminary experiment to see if my method would work and if there were any problems with the way I will conduct my experiment. Preliminary Results Temperature (i C) Distanced Bounced (Cm) 90 81 40 68 0 20 Factors affecting my experiment If I use different squash balls of different elasticity it will affect the bounciness of the ball.   If I use different surfaces for the ball to bounce on, I may get different results because different surfaces absorb energy better than others.   If the temperature increases, then in theory the bounciness should increase. This is because the atoms have more energy so theyll move faster; theyll have more kinetic energy inside the ball. This creates more pressure making the ball harder and bouncier. I increase the height I drop the ball from, the gravitational potential energy increases. The ball will have more energy so the bounciness increases. This formula shows how to work out the amount of energy the ball has at each height: Gravitational Potential Energy=Mass x Gravitational Strength (10N) x Height   The older the ball is, the less elastic it is. Obtaining Evidence i Temperature of the ball Distanced Bounced (Cm) 1st Test 2nd Test 3rd Test Mean Rounded Mean have carried out my plan and have used my equipment precisely to observe and measure the rate of reaction to a good level of accuracy. I have taken a sufficient number of accurate results and have recorded them in a table. I dont need to repeat any readings as none of them look to be anomalous. I made no changes to my plan but carried out a preliminary to make sure I wouldnt have to make any changes half way through the experiment. I made sure I was wearing safety goggles while I was heating the water with a Bunsen burner to protect my eyes. I stood up throughout the experiment to lower the risk of injury. When I took the squash ball out of the beaker I used tongs so I didnt burn my hands. Analysing Evidence. We will write a custom essay sample on The effect of temperature on a squash ball specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on The effect of temperature on a squash ball specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on The effect of temperature on a squash ball specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Ive plotted my results onto a line graph and a clear pattern is seen. As the temperature of the ball is increased, the distance the ball bounces is also increased. The squash ball starts to bounce higher and higher after every 10 degrees, but towards the end the distance of the ball doesnt increase as much than the first few points on the graph. This can be shown by looking at the gradient at the beginning of the graph and at the end. At the beginning, the gradient is 1. 23, towards the end the gradient is 0. 44, this shows that its decreased which means theres less difference between the results towards the end. This means that after a while the ball isnt affected as much by temperature. In my investigation I found out that temperature does affect the bounciness of the squash ball, like I said in my prediction. I thought this would happen because as the temperature increases the pressure inside also increases making the ball harder and bouncier. The pressure increases because the atoms are moving around with more force and faster because they have more energy. My results back this up. I dont have any extreme anomalies but my second point on the graph is a bit anomalous. This could be or a number of reasons due to human error. For example I might not have seen the distance the ball bounced correctly, or I might have dropped the ball a little bit lower than the other times. Evaluation The evidence I obtained was good for the simplicity of my investigation. I think the way in which my investigation was carried out was effective but could have been more accurate. For example, I carried out all of it. If I used machines or computers it would have been a lot more accurate. If I had the equipment to this I would have a machine drop the squash ball from an exact point and use either or video camera or light motion sensor to get the exact measurement of the bounce. This would be a lot more accurate than my own eyesight. But saying that, my results were very accurate without machines and I can see this by how Ive plotted them on the graph. They were easily accurate enough to make a firm conclusion on that increasing the temperature increases the bounciness of the ball. There werent any results that didnt fit into the main pattern. I think this is because I took great care while carrying out the experiment. There are many other experiments I could do to extend the work Ive done. For example I could look at all the other factors that affect the bounciness which I mentioned in my plan. I think an interesting one would be to change the material the ball lands on, to see which material absorbs the most energy.

census essays

census essays The plan for the 2000 census will make an unprecendent effort to contact every living person living in the United States and will contact more people than in any previous census. With statistical methods for nonrespondents, the Census 2000 will be the most complete accounting of the U.S. population ever. Statistical Sampling should not be a partisan issue . It is an American issue. It's about making sure that every American really and literally counts. It's about gathering fair and accurate information that we absolutely have to have if we are going to determine who we are and what we have to do to prepare all our people for the 21st century. We do a census every 10 years. Even the first time, when Thomas Jefferson sent federal marshals on horseback, we relied on the system of going to the households to count these people (Riche 34). As the years continued on and the population grew, It began to be more time consuming and progressively more expensive. In 1970, we started counting people by mail. We asked that Americans fill out the census forms and then send them back for processing (Riche 34). This is the current method in use. We know that the census missed 8 million Americans living in inner-cities and in remote rural areas in 1990 (Clinton par.3 ). We also know that we double-counted 4 million Americans, many of whom had their own home (Riche 34). The census missed 482,738 in the state of Texas; 66,748 of them in Houston alone (Clinton par. 3). With the current method of the census, the problem are not getting solved. Congress concluded in 1990 that the census failed on two grounds: It cost too much and measured two few people (Riche 35). Inaccurate information causes some of the biggest problems. For example, the United way recieves generous grants for very wealthy individuals. If the census is inaccurate, then it has an indirect effect on private ...

ApushRevolution of 1800

Previous presidents had done what they could to stay neutral in foreign battles and conflicts, but Thomas Jefferson took initiative and this is also present in the XYZ affairs with France. Jefferson brought the country into its real first international involvement. With judiciary, the real revolutionary happening of the time period was with the Marbury vs. Madison case when the Supreme Court was given the power of judicial review of the laws and actions by the federal government. It allowed for the Supreme Court to rule federal laws invalid if they conflicted with the Constitution. Politically, Jefferson believed in strict interpretation of the Constitution unlike his predecessors. He bought the Louisiana Purchase which the Constitution did not fully allow him to do. Under Federalist views, the economy of the United States was looking to be increasingly more urban with a shift from agricultural ways. With Thomas Jefferson being elected into office, he hoped that America would maintain a strict agrarian economy with crops being the top export to foreign countries. He wanted Americans to stay a primarily rural-living nation with farming the main aspect of the economy. The election of 1800 was also considered a revolution because politics changed hands from Federalists with strict views on centralization and creating a stronger national government to Republicans with the hopes of creating strong state legislatures and a stricter foreign policy where manufacturing was less important. The succession of Republicans contributed to it being called a revolution. ApushRevolution of 1800 Previous presidents had done what they could to stay neutral in foreign battles and conflicts, but Thomas Jefferson took initiative and this is also present in the XYZ affairs with France. Jefferson brought the country into its real first international involvement. With judiciary, the real revolutionary happening of the time period was with the Marbury vs. Madison case when the Supreme Court was given the power of judicial review of the laws and actions by the federal government. It allowed for the Supreme Court to rule federal laws invalid if they conflicted with the Constitution. Politically, Jefferson believed in strict interpretation of the Constitution unlike his predecessors. He bought the Louisiana Purchase which the Constitution did not fully allow him to do. Under Federalist views, the economy of the United States was looking to be increasingly more urban with a shift from agricultural ways. With Thomas Jefferson being elected into office, he hoped that America would maintain a strict agrarian economy with crops being the top export to foreign countries. He wanted Americans to stay a primarily rural-living nation with farming the main aspect of the economy. The election of 1800 was also considered a revolution because politics changed hands from Federalists with strict views on centralization and creating a stronger national government to Republicans with the hopes of creating strong state legislatures and a stricter foreign policy where manufacturing was less important. The succession of Republicans contributed to it being called a revolution.

Alchol and its effects on health Essay Example | Topics and Well Written Essays - 1500 words

Alchol and its effects on health - Essay Example Binge drinking has become rampant in many parts of the world including Europe (Picture-1). According to a study by Anderson & Baumberg (2006), 55 million adults are estimated to drink at harmful levels in the Europe. Harmful consumption of alcohol means more than 40g of alcohol i.e. 4 drinks a day for men and over 20g i.e. 2 drinks a day by women (Anderson & Baumberg, 2006). To understand the effects of alcohol on the health of humans, it is important to first understand the metabolism of alcohol. The cell membranes of human body are highly permeable to alcohol. Once alcohol is absorbed from the stomach, it reaches every tissue in the body. It is mainly metabolized in the liver. The mode of metabolism is oxidation. The first step in the oxidation is conversion of ethanol to acetaldehyde and this is catalyzed by alcohol dehydrogenase. During this process, NADH (NAD, nicotinamide adenine dinucleotide) is released. The acetaldehyde is further oxidized to acetic acid which then enters the citric acid cycle and metabolized to carbondioxide and water. NADH is used up in the conversion of pyruvic acid to lactic acid, in the synthesis of lipids and in the electron transport chain (Paton, 2005). Most of the damage to cells caused by ethanol is due to acetaldehyde and NADH. Acetaldehyde causes damage due to immune response and increased NADH causes altered NADH/N AD ratio leading to increased oxygen consumption and hypermetabolic state (Tome & Lucey, 2004). The effects of alcohol change over time. This is known as biphasic effect. The side effects depend on the level of intoxication which is again dependent on many other factors like the amount and circumstances of consumption, whether taken before or after meals and also the hydration status of the body. Consumption of alcohol after a heavy meal does not produce much intoxication while consuming on empty stomach leads to increased side

Race and the Death Penalty Research Paper Example | Topics and Well Written Essays - 3750 words

Race and the Death Penalty - Research Paper Example In every modern society, there are authorities to impose punishments on wrongdoers and the nature of authorities varies with the kind of offenses. For example, a child who breaks the rules of a family at home is punished by his parents or the other elderly members. But, in the society when someone gets involved in illegal activities is punished by the criminal judicial system. There are two major reasons for inflicting punishment on criminals: one belief is that it is fair that people who break the law be punished according to the level of his offence, and the second belief is that punishments will discourage offenders from repeating their wrongdoings in the future and will also put fear in the minds of others from doing wrong. These two beliefs are universal in every human society. The debate surrounding the necessity of punishments including capital punishment, therefore, does not focus on the â€Å"basic principles but on the fairness, appropriateness, and effectiveness of specif ic punishments for specific offenses.†1 Because of the irrevocable nature of the death penalty, it is the most criticized form of punishment. In the United States, racial prejudices were pervasive and played an important role in the decision of the jury in regard to death penalties as â€Å"the color of a defendant and victim’s skin plays a crucial and unacceptable role in deciding who receives the death penalty in America.†2 It has been seen that an offender is more likely to get the death penalty if the murdered victim is a white man. This paper focuses on the racial prejudices surrounding death penalty in the United States. Before studying the death penalty from the angle of racial prejudices it is important to note that racism is a major part of the American society.

Arthur Miller Essay Example for Free

Arthur Miller Essay The theme of morals and guilt is explored by the characterization of John Proctor. Proctor is portrayed as being around the age of thirty and a well-respected farmer in the towns community. He is described as the kind of man- powerful of body, even-tempered, and not easily led. From these descriptions, we recognize that he is a strong, calm individual who is quite cynical. As soon as Proctor appears in the play we see that he is very much in conflict with himself due to the terrible secret he conceals within the dark and forbidding chambers of his heart. A history of sin, which goes against every moral fibre of his body and the society in which he dwells. He is a sinner, a sinner not only against the moral fashion but against his own vision of decent conduct. John Proctor is guilty of committing adultery with the young Abigail Williams while she was serving as a servant in his household and this has a great effect on his conscience. Proctors conscience eats away at him throughout the play as it manifests itself into his relationship with people, especially his wife, Elizabeth. This is presented when Elizabeth states: I do not judge you. The magistrate sits in your heart that judges you. I never thought you but a good man, John- only somewhat bewildered. Here we see the idea of morality being reflected on a personal level, or Proctors conception of himself. He conceives himself as a blatant sinner because of his raw deeds, being his lechery. I blush for my sin, he admits to his wife. Overall, through the characterization of John Proctor the theme morals and guilt is presented and from this we see that his perception of right and wrong are decided by his own vision of decent conduct. Characterization is essential to the exploration and development of themes in The Crucible by Arthur Miller. The characterization of Rebecca Nurse explores the theme of evil. Abigail Williams explores the themes of evil as well as the power of fear and John Proctor explores the theme of morals and guilt. All these characters and many more help develop the themes within The Crucible.

What Women Most Desire Essay -- Essays Papers

What Women Most Desire In "The Wife Of Bath’s Tale", women most desire sovereignty over men in relationships. In other words, the power to have dominance over men is the one thing women most desire. I agree with the ideas that in relationship women wish to be dominant over the opposite sex. The only way such power is earned or give is when the man is in a situation where the woman must bail him out of trouble. Women have the ability to get what they want, when they want it. Chaucer portrays the Wife of bath as the dominant person in her marriages. She looks at men as her trinkets to be used and played with. She moves from one man to another, always looking for more. The Wife of Bath is a control freak, wanting to have sex when she desires it and with whom she desires. Her tale discusses a knight desperate for an to the question, what do women most desire? The answer is in the hands of an old lady who is described as an ugly, horrid fowl creature. In return for the answer the decrepit woman wants the knight to marry her. The knight has no choice and marries the hag. The knight was truly the one with no power and the hag was holding all the cards. The knight is in a lose-lose situation without the answer he was to be beheaded. The knight repulsed and angry married the hag. He was probably thinking that death by decapitation might have been the better than to live with the same old, ugly woman for the rest of his god-forsaken life. The knight in the tale had no choice but to submit to the sovereignty of the old hag. If the knight was a little smarter and did his homework in trying to say, "Hey, how does this old hag know the answer to what women most desire? She’s probably never been with a man before!" The knight was ... ...sed on the information given in the tale, I feel that women don’t desire to have power over their husbands. However, I do feel that women desire to have power, just not total power over their husbands like the Wife feels. I feel that women like to have an equal balance of power with men. I do not think that the Wife sees this as being possible. She seems to be so angry at men, because of the bad experiences that she has with her five husbands, and she doesn’t seem to want to change her belief in the fact that women have so much power. She actually demonstrates the power that women have towards her five husbands. She always seemed to get her way with them. Sadly, in today’s society, women are still not given the proper credit they deserve. It is shameful that women don’t receive equal representation in many situations. This is a topic that is still debated to this day.