Investigation to determine the viscosity of glycerol Essay Example for Free

Investigation to determine the viscosity of glycerol Essay This document reports on an experiment that examined the relationship between temperature and viscosity. The terminal velocity and up-thrust experienced by a sphere of fixed weight and radius was calculated by dropping it into a measuring cylinder filled with glycerol heated to different temperatures. Using Stokes Law viscosity corresponding to each temperature level was worked out. This generated a range of data points with viscosity corresponding to each temperature level. These data points were statistically analysed. The results corresponded to those indicated by theory i. e. temperature and viscosity are inversely related; as temperature increased viscosity decreased. This report is in five sections. The first details the plan and the science on which the experiment is based. The second describes implementation while the third analyses the results. The fourth section evaluates the both the experiment and its results. The fifth concludes. 1 Plan 1. 1 The Question Is viscosity affected by temperature? When temperature increases does viscosity decrease or increase and if it does are the changes systematic or random? These are the questions I investigate in this experiment. 1. 2 Key Concepts Archimedes principle A body immersed in a fluid (totally or partially) experiences an upthrust (i. e. an apparent loss of weight) which is equal to the weight of fluid displaced. 1Ships dont sink in water because of upthrust. Upthrust is also the cause for weight loss when a body is partially or wholly immersed in a fluid. Viscosity Viscosity is the virtue by which a fluid offers a resistance to the motion through it of any solid body. 2 The theory of viscosity is almost identical to the theory of friction between two solids, just that viscosity is the term used for fluids. Viscosity is basically the resistance between the particles within a fluid. In a solid molecules are tightly packed i. e. there is a strong intermolecular force. Therefore when you move a solid, it moves as a whole as all the particles move together. In a fluid this is not the case. This is because due to lower intermolecular force the particles move at different velocities in relation to each other. This feature can be understood by discussing what happens when pouring a jug of water into a glass. In liquids the molecules flow in layers. See the right water flowing from a jug, it looks simple, but in reality it is quite complex. Actually only the top layer of water is flowing, the bottom layer is still. This is explained with the help of the diagram on the left. The red line is the upper layer of water in the jug which flows in the glass, when this layer has flown into the glass the maroon layer starts flowing and the finally the black layer. This is because the black layer is closest to the solid (which in this case is the jug); the resistance offered by the solid is greater than the resistance offered by the layers of the liquid. This is because the number of molecules that make contact between the solid and the liquid layer are more than those that make contact between the liquid and liquid layer. The number of molecules that have contact between the liquid layer and air is the least. Hydrogen Bonding Unusually strong dipole-dipole attractions that occur among molecules in which hydrogen is bonded to a highly electronegative atom. 3 Hydrogen bonding is a much stronger variant of Van Der Waals Forces. This strong bonding causes great friction between the layers of liquid and therefore gives glycerol its property of high viscosity. Glycerol has a high viscosity as opposed to other alcohols because, it has three -OH functional groups attached to it. Therefore more hydrogen bonds are formed, thus increasing the attraction between two neighbouring molecules (greater bond strength). Thus unlike alcohols that are volatile, glycerol is not only non-volatile, but is also very thick and viscous. Stokes Law Stokes Law plays an important part in understanding the motion of a solid (in his experiment he used a sphere) through liquids. Stokes law states that when a body is under free fall in a tube containing a liquid of infinite length there is a point when there is no more acceleration in the body and the body reaches terminal velocity. Stoke further went on to say that this was due to the viscous forces acting within the liquid. The layers of the liquid in contact with the solid start moving with the velocity of the solid particle whereas the layers far away from the body remain at rest. The viscous forces being frictional forces act against the acceleration of the body and therefore there is a point when the viscous forces equal the resultant force driving the body. This is when the body reaches its terminal velocity.

Essays --

​For years humans and animals alike have relied on natural instincts to adapt in order to survive. The book call of the wild by Jack London centers around a dog named buck. Buck is large mixed bread who learns to use natural instincts to survive the harsh conditions during the Klondike gold rush in Alaska in 1897. The Klondike gold rush of 1897 is an example of the back to nature movement. The back to nature movement was initiated by President Roosevelt. He felt that America was too dependent on technology. The back to nature was generally an experience of survival. He felt that if people couldn’t survive in the wild, then they were becoming weak. The book emphasizes Buck’s parting from civilization and his entry into a more primitive world. Jack London tries to show the contrast between civilized life and primitive life. This contrast is prevalent throughout the novel. The story of Buck’s journeys in Klondike shows how he gradually sheds all the features that define his earlier life in human society to become a creature of the wild. Throughout Jack London’s book, ideas of Social Darwinism and the back to nature movement comes to mind because Physical strength, as well as dominance, is required in order for one to truly embrace nature and survive. ​In the book, the theme of man vs. nature is present. The Klondike gold rush of 1897 is an example of the back to nature movement. Set in the wake of the gold rush, the story shows how Americans found themselves moving up north in search of gold. They had to live their civilized setting and adjust to the harsh cold of the north where survival was only imperative. Man had to rely on basic instincts in order to survive away from civilization. For example, men like John Thornton have been a... ...re. People usually regain natural instincts in the process. He generated the idea that if humans go back to nature, they would become stronger and more self-reliant. In the wake of the gold rush, man had to venture into the bitter cold (back to nature). People like john Thornton thrived because they were able to key into their natural instincts. Jack also highlighted that over reliance on civilization makes one weak. This is shown when Hals, Charles and Mercedes die off because they were unable to use instincts to cope with the harsh situations of the wild. Because of this, buck was able to make the transition from lovable play pal to a skilled hunter. By getting in touch with his natural instinct, he was able to change his way of life and survive in the environment he found himself. Buck becomes wild and uses social Darwinism and survival of the fittest to survive. Essays -- ​For years humans and animals alike have relied on natural instincts to adapt in order to survive. The book call of the wild by Jack London centers around a dog named buck. Buck is large mixed bread who learns to use natural instincts to survive the harsh conditions during the Klondike gold rush in Alaska in 1897. The Klondike gold rush of 1897 is an example of the back to nature movement. The back to nature movement was initiated by President Roosevelt. He felt that America was too dependent on technology. The back to nature was generally an experience of survival. He felt that if people couldn’t survive in the wild, then they were becoming weak. The book emphasizes Buck’s parting from civilization and his entry into a more primitive world. Jack London tries to show the contrast between civilized life and primitive life. This contrast is prevalent throughout the novel. The story of Buck’s journeys in Klondike shows how he gradually sheds all the features that define his earlier life in human society to become a creature of the wild. Throughout Jack London’s book, ideas of Social Darwinism and the back to nature movement comes to mind because Physical strength, as well as dominance, is required in order for one to truly embrace nature and survive. ​In the book, the theme of man vs. nature is present. The Klondike gold rush of 1897 is an example of the back to nature movement. Set in the wake of the gold rush, the story shows how Americans found themselves moving up north in search of gold. They had to live their civilized setting and adjust to the harsh cold of the north where survival was only imperative. Man had to rely on basic instincts in order to survive away from civilization. For example, men like John Thornton have been a... ...re. People usually regain natural instincts in the process. He generated the idea that if humans go back to nature, they would become stronger and more self-reliant. In the wake of the gold rush, man had to venture into the bitter cold (back to nature). People like john Thornton thrived because they were able to key into their natural instincts. Jack also highlighted that over reliance on civilization makes one weak. This is shown when Hals, Charles and Mercedes die off because they were unable to use instincts to cope with the harsh situations of the wild. Because of this, buck was able to make the transition from lovable play pal to a skilled hunter. By getting in touch with his natural instinct, he was able to change his way of life and survive in the environment he found himself. Buck becomes wild and uses social Darwinism and survival of the fittest to survive.

Homeland Security Essay

Homeland Security is a cabinet level agency in the federal government. Its birth came after the terrorist attacks on September 11th, 2001. Its main goals were to deter terrorism on U. S. soil and the safety of the American infrastructure. It has been reported many times the trouble this department is having getting off the ground. â€Å"Hardly a day goes by without some fresh report on a contract gone bad, a new technology that does not work, a new Coast Guard cutter that is not seaworthy, or more cargo that slips through port without inspection† (Light, 2007). Every year new assessments of the department including Congress, the 9/11 Commission and the departments own inspector general gives it low grades for job satisfaction, management, and leadership. Just some of the problems it is having are high turnover, internal bureaucratic struggles and structural problems. So with all that said it is having problems reaching many of its outlined goals. It still needs funding, authority, better strategy for protecting American soil, personnel, better screening at airports for passengers and employees, and better technology to find weapons such as explosives. Improved intelligence capabilities are probably the most important. Border security issues were the founding fathers main focus when he was with the agency and I am in agreement. Securing our countries boarders on a daily basis is the Homeland security’s main concern. The military that has done that job up until now but with the world being global we need to separate the two and give each their own set of ground rules to operate at an optimum level. The merging of immigration and customs enforcement can only help in making this department function at a level the American public can be proud of with the goals of this office being completed (Magleby, O’Brien, Light, Peltason, & Cronin, 2006). Even with all its imperfections I still believe that it is a needed department in our government. A somewhat more rigid department to handle military type action on homeland soil was needed and was realized on 9/11. We had been living in a glass house and it was just a matter of time. The partnership it is creating with state and local governments especially with intelligence from federal sources will build a safer America. After the disaster of Katrina in 2005 it was more obvious that this newly formed department would need some redesign in its structure. But I think with having Homeland Security it will help to build a better military. This would allow more forces to be deployed outside our borders when needed. I think now if Homeland Security had been up to par, would we still be in Iraq or would the troops the Republicans so desperately want to send be there and back by now? Reference: Light, P. (2007, Spring). The homeland security hash. Wilson Quarterly, 31(2). Magleby, D. B. , O’Brien, D. , Light, P. , Peltason, J. W. , & Cronin, T. E. (2006). Government by the People: National, State, and Local 21st. Ed. New Jersey: Prentice Hall.

Hubris - 1004 Words

Guidelines for Article Reviews *MGNT 7330*, *Spring ‘*10 Student identification: Citation: Kroll, M.J., Toombs, L.A., Wright, P. 2000. Napoleon’s tragic march home from Moscow. Academy of Management Executive, Vol. 14 (1): pp. 117-127. Theoretical framework: The authors of this article believe that hubris comes from four major sources which feed into the individual and if the person is weak to the hype generated by their success that they will fall victim to hubris and the implications it brings. The four sources of hubris that the article discusses are narcissism, series of successes, uncritical successes of accolades, and an exemption from the rules. The three implications that are a result of a hubris person are their†¦show more content†¦I think it is important that the article should comment on the fact that having the opposite of hubris is not always successful. Implications for practitioners: I think this article should be sent to every CEO and upper level manager in every company around the United States as I feel that there is a sense of invulnerability or â€Å"to large to fail† methodology going on. Companies which are successful are losing their competitive edge and becoming lazy becaus e they feel that they have won the game and now are in cruise control mode. A good example of this is in the extremely competitive automotive industry where Toyota which is the world’s largest manufacturer of vehicles is having a massive 4 million car recall over faulty parts and poor software implementation. Toyota has built their business name on reliable and safe products and I feel that over the last several years their products have not lived up to their namesake as quality has been slipping. This article could help upper level management look at their history and see that they are not invincible and help stop the bleeding of customers they are currently facing. Implications for pedagogy: This article is limited to the domain of upper and middle management leadership which has the ability to make changes in their work place. I believe thisShow MoreRelatedArthur Miller s Death Of A Salesman1159 Words   |  5 Pagesthe same time loses herself. One’s own self can be the cause for the loss of identity, as Sophocles’ Oedipus the King illustrates. Oedipus’ characteristics of pride and determination are the sources to the downfall of his identity. Oedipus depicts Hubris, a tragic flaw of excessive pride and arrogance that causes him to overestimate his abilities to a degree that he loses reality of himself. 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