HW__4_P213_F08 - 2 and 3 4 are isochoric and the processes...

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Physics 2213 Homework #4 Fall 2008 Read: Chapter 20.1 – 20.7 For practice: Chap. 20: Q's #Q20.2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 17, 20 E's & P's #20.1, 5, 13, 19, 21 To be prepared by 9/25. Not Quizzed, but included as part of Prelim 1 coverage: #20.3 [Gasoline Engine] #20.12 [A Freezer] #20.23 [Maximum Output] #20.45 [Ocean Thermal Energy] #20.44 [Designing a Carnot Engine] #20.25 [A Bored Sophomore] #20.52 [Coal-Fired Power Plant] 1. [Otto Engine] The Otto engine is a slightly idealized version of the gasoline engine used in most present-day automobiles. It is a heat engine containing n moles of ideal gas, which is working on a cycle shown in the figure, where the processes 1
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Unformatted text preview: 2 and 3 4 are isochoric and the processes 2 3 and 4 1 are adiabatic. (a) Compute the amounts of heat absorbed and discarded by this engine in one cycle, in terms of the temperatures of the turning points, T 1 , T 2 , T 3 , and T 4 , and the constant-volume molar heat capacity of the gas C V . (b) Obtain a formula for the thermal efficiency of the engine in terms of T 1 , T 2 , T 3 , and T 4 . (c) Using the relationship between T and V for an adiabatic process, obtain a formula for the thermal efficiency of the engine in terms of the compression ratio r=V 3 /V 2 and the heat capacity ratio of the gas . #20.53 [Fuel Efficiency of a Volkswagen]...
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This note was uploaded on 10/25/2008 for the course PHYS 2213 taught by Professor Perelstein,m during the Fall '07 term at Cornell University (Engineering School).

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