MasteringPhysics-ch 17

# MasteringPhysics-ch 17 - MasteringPhysics Assignment Print...

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm. .. 1 of 17 12/9/07 7:02 PM [ Print View ] physics 2211 MP19: Chapter 17 Due at 5:30pm on Monday, December 10, 2007 View Grading Details Simple Ways of Expanding A plot of pressure as a function of volume is known as a pV diagram. pV diagrams are often used in analyzing thermodynamic processes. Consider an ideal gas that starts in state O, as indicated in the diagram. Your task is to describe how the gas proceeds to one of four different states, along the different curves indicated. Although there are an infinite number of such curves, several are particularly simple because one quantity or another does not change: Adiabatic : . No heat is added or subtracted. Isothermal : . The temperature does not change. (The prefix "iso" means equal or alike.) Isobaric : . The pressure does not change. (A barometer measures the pressure.) Isochoric : . The volume does not change. (This process is infrequently used.) The key idea in determining which of these processes is occurring from a pV plot is to recall that an ideal gas must obey the ideal gas equation of state: (where the constant is the Boltzmann constant , which has the value in SI units). Generally , the number of gas particles, is held constant, so you can determine what happens to at various points along the curve on the pV diagram. Note that in this problem, as is usually assumed, the processes happen slowly enough that the gas remains in equilibrium without hot spots, without propagating pressure waves from a rapid change in volume, or without involving similar nonequilibrium phenomena. Indeed, the word "adiabatic" is often used by scientists to describe a process that happens slowly and smoothly without irreversible changes in the system. Part A What type of process does curve OA represent? Hint A.1 What quanitity remains constant? Curve OA is horizontal; the pressure of the system remains constant throughout this process. What is the name of a process in which pressure remains constant?

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm. .. 2 of 17 12/9/07 7:02 PM ANSWER: adiabatic isobaric isochoric isothermal Part B What type of process does curve OC represent? Hint B.1 Relationship between pressure and volume When , ; when , . Evidently, pressure is proportional to the inverse of the volume. What is the name of a process in which is proportional to ? Hint B.2 Use the ideal gas law Recall the ideal gas equation of state for a fixed amount of gas: , where is some constant. Solving this equation for yields . If is to be proportional to , the temperature must remain constant throughout the process. What is the name of a process in which temperature remains constant? isobaric isochoric isothermal Detailed analysis of curve OB The following questions refer to the process represented by curve OB, in which an ideal gas proceeds from state O to state B.
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## This note was uploaded on 10/11/2008 for the course PHYS 2211 taught by Professor Duncan during the Fall '08 term at Georgia Perimeter.

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MasteringPhysics-ch 17 - MasteringPhysics Assignment Print...

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