Rate of cooling Essay Example for Free

Rate of cooling Essay The problem for this experiment is to investigate the rate of cooling in three different types of cups. They will be used as typical coffee cups for commercial purposes. The cups a polystyrene cup, a paper cup and a plastic cup. Water has a high specific heat capacity. This makes it a very useful material for storing and carrying heat energy. Its heat capacity is 4200 joules per kilogram per i C (4200J/kg i C). Heat tends to flow away from a hotter object to a cooler surroundings. Heat is mainly lost I conduction, convection, radiation and evaporation. For this experiment I will be only using convection, radiation, evaporation because conduction is mainly in solids. Convection Convection mainly occurs in gasses and liquids gases and liquids are very poor conductors so convection is usually dominant process. When convection cant occur, the heat transfer by conduction is very slow. Convection only occurs when the more energetic particles move from hotter region to a cooler region and take their heat energy with them. Convection doesnt happen in solids because there are no particles movement. Radiation Radiation travels through anything transparent. Heat radiation is given out by anything warm or hot. The amount of it that is absorbed or released depends on the colour and texture of the material. Heat radiation is also called infra-red radiation. It consists purely of electromagnetic waves of a certain frequency. All objects continually absorb and release heat radiation. The hotter the object the more heat radiation it release. Dark surfaces absorb more heat radiation than bright surfaces. Silver surfaces reflect nearly all heat radiation falling on them. Evaporation Evaporation is when water vanishes without boiling it to change into gas. This is because some liquid molecules move faster than others and the ones close to the surface may escape and form a gas. Variables These are things that may change during an experiment The independent variable: These are things that I will decide to change e. g. the material of the cup, replacing equipment. The dependent variable: This is the measurement that is effected by the independent variable e. g. the rate of cooling. The control variable: These are the things that I will try to keep the same so I can make sure that its a fair test e. g. volume of water, room temperature, size of the cups etc. Hypothesis I predict that the polystyrene cup would cool down the slowest because it has thick walls and when you go to restaurants and ask for a hot drink they give it in polystyrene cup. I think the paper cup will cool down the quickest because its made out of paper and paper has thin walls and it absorbs water.

Racism in Ken Keseys One Flew Over the Cuckoos Nest :: One Flew Over Cuckoos Nest

Racism in One Flew Over the Cuckoo's Nest Sometimes things that seem crazy actually make sense. A good example is the narrator of One Flew Over the Cuckoo's Nest, Chief Bromden. He appears to be an insane patient at a mental hospital who hallucinates about irrational mechanical people and a thick fog that permeates the hospital ward where he lives. In reality, Bromden's hallucinations provide valuable insight into the dehumanization that Bromden and the other ward patients are subjected to. Ken Kesey, in his writing of One Flew Over the Cuckoo's Nest brings out his racism in the novel. The Aides in Kesey's novel, who are also called "black boys," negatively portray blacks as inferior to white people in society. The aides had a poor, rough childhood growing up as seen by their lack of education as seen in the quote "`Why, who you s'pose signed chief Bromden up for this foolishness? Inniuns ain't able to write'" (191). Their aides' hatred of the patients stems from their rough childhood. They are also cast as irresponsible and unable to carry out simple jobs. This is evident in the quote "`I'll take him. He's always untying his sheet and roaming around.'" (147), when Turkle, the night-shift aide, lies to the nurse in charge at night by saying that Bromden untied his sheets, when Turkle Irresponsibly untied Bromden's sheets for him. On the morning of the fishing trip on Nurse Ratched's ward, one of Ratched's aides called Bromden illiterate because he was half-Indian. The General statement made by the aid, which was in the quote "`Why, who you s'pose signed chief Bromden up for this foolishness? Inniuns ain't able to write.'" (191), describes Kesey's racism toward Indians. The quote reflects how Indians in Kesey's novel are portrayed as illiterate. Bromden also represents the Indians as imprisoned at the mercy of white people. In Kesey's novel Indians, such as Bromden's father were forced to hand over their land to white people. The Indians' land was very important to them and being forced to give up land was essentially giving up their freedom. The types of jobs that the hospital workers have also indicate Kesey's racism in his novel.

A Sartrean Life

Sartre holds that â€Å"existence precedes essence. † A human being is simply what he or she wills to be. Sartre believes that we are defined by what we do. We are what we choose to do. Existentialism is not an easy concept to explain, and Sartre agreed. He summed up existentialism as existence precedes essence. What does that really mean? Sartre explained it using the analogy of the paper cutter. He said that an artisan whose inspiration came from a concept made the paper cutter. The artisan referred to the concept of what a paper cutter was and created it with a known method of production (part of the concept of the cutter) with a routine. The paper cutter was produced a certain way creating on certain use for it. Therefore, the essence (the pre-production intent and method of creation) came before the actual existence of the paper cutter, its intent and plan for production was already determined. Existentialism is the opposite of this. If it were existentialism, the cutter would have been created at random without anyone knowing the intent of it until the artisan determined an intent for the cutter after its production. Following this line of thought, I find myself in a situation where there would be no despair at all because all the hope lies in ones self. I define myself and my purpose in my life and I then take responsibility for my choice by living out my self-determined purpose. . The supreme virtue of existentialism is ultimate choice. This can only have been obtained if I am true to myself. I also have to take responsibility for my own actions because I choose my own actions and must live with the consequences. I can choose what I become and have to live with it, but I can change it to create a better fit if I thought my choice wasn't totally correct. Although Sartre’s philosophy has many advantages and it builds itself on the belief that we create our own choices and we are responsible for ourselves. I believe that many people will not take the challenge or back out in fear of the responsibility. This occurs because there is no way for the people to know for sure that the choice they make as their definition of themselves is correct. This creates a fear in many people, a fear of being wrong and a fear that being wrong could lead to their demise. Sartre admitted there was much anguish in taking the existential challenge because there was no way of knowing one was right. Sartre's advice to the leery was to be human, stick to ones self, and just hope for the best. This was the point where existentialism neared the thin line between philosophy in religion because to take this challenge, people had to have a belief in themselves in order to stick with their choices. Existentialism got much criticism not only because it was mainly atheistic, but also because of the morals it created. Actually, the morals were not created by existentialism, but by existentialists. They created their own morals and values to comply with choosing their own purposes in life. The meaning of their lives directly paralleled the values chosen, in fact Sartre thought that the values chosen is what ones meaning of life was based upon. This idea was strongly criticized by many people because they feared that this could create anarchy. If everyone created their own values, there would be no set laws in which to obey. Sartre stated that ones conscience would be able to determine between right and wrong; and that one could tell if their choice of action served an injustice to another person. Many were very skeptical of this, however; fearing that, for example, backing out of an agreement was acceptable to some, but would not be acceptable to others. In conclusion, despite the large amount of criticism, Sartre was widely followed and looked upon highly by many. He could support his ideas with reason and logic. These ideas appealed to large amounts of people because of the circumstances they were in. The timing of Sartre was part of what created such a large following. Throughout history, change and the following of new and sometimes radical ideas came right after a large disaster in which people were left in despair looking for hope. If there is one thing to remember about existentialism it is that existence precedes essence. If one is an existentialist or not: one gets out of life what one puts in; the meaning of our lives comes not from what happens in our lives, but what we do in them; and every one of us are actors on the stage of life. In closing, Sartre said it best when he commented, â€Å"Man is encompassed by his own existence and there is no exit. â€Å"

Electronic Mass Media - 1228 Words

ELECTRONIC MASS MEDIA IN TODAY’S SOCIETY MASS MEDIA Mass media refers collectively to all media technologies, including the Internet, television, newspapers, and radio, which are used for mass communications, and to the organizations which control these technologies. Mass media play a significant role in shaping public perceptions on a variety of important issues, both through the information that is dispensed through them, and through the interpretations they place upon this information. The also play a large role in shaping modern culture, by selecting and portraying a particular set of beliefs, values, and traditions (an entire way of life), as reality. That is, by portraying a certain interpretation of reality, they shape reality†¦show more content†¦| |37 |Heliographs - first recorded use of mirrors to send messages by Roman Emperor Tiberius. | |100 |First bound books | |105 BC |Tsai Lun of China invents paper as we know it. | |305 |First wooden printing presses invented in China - symbols carved on a wooden block. | |1049 |First movable type invented - clay - invented in China by Pi Sheng. | |1450 |Newspapers appear in Europe. | |1455 |Johannes Gutenberg invents a printing press with metal movable type. | |1560 |Camera Obscura invented - primitive imageShow MoreRelatedWhat is Mass Media?917 Words   |  4 PagesWhat is Mass Media? Mass media refers to the many ways that information reaches a large group of people. Sociologists study mass media to see its affects on socialization, social movement, and social power (Chegg, â€Å"Definition of Mass Media†). 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