Physics for Scientists and Engineers With Modern Physics

9th Edition

ISBN: 9781133953982

Author: SERWAY, Raymond A./

Publisher: Cengage Learning

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Textbook Question

Chapter 22, Problem 30P

Suppose you build a two-engine device with the exhaust energy output from one heat engine supplying the input energy for a second heat engine. We say that the two engines arc running in series. Let e₁ and e₂ represent the efficiencies of the two engines. (a) The overall efficiency of the two-engine device is defined as the total work output divided by the energy put into the first engine by heat. Show that the overall efficiency e is given by

e = e 1 + e 2 − e 1 e 2

What If? For parts (b) through (e) that follow, assume the two engines are Carnot engines. Engine 1 operates between temperatures T_h and T_i. The gas in engine 2 varies in temperature between T_i and T_c. In terms of the temperatures, (b) what is the efficiency of the combination engine? (c) Does an improvement in net efficiency result from the use of two engines instead of one? (d) What value of the intermediate temperature T_i results in equal work being done by each of the two engines in series? (e) What value of T_i results in each of the two engines in series having the same efficiency?

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Chapter 22, Problem 29P

Chapter 22, Problem 31P

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Chapter 22 Solutions

Physics for Scientists and Engineers With Modern Physics

Ch. 22.1 - The energy input to an engine is 4.00 times...Ch. 22.2 - The energy entering an electric heater by...Ch. 22.4 - Three engines operate between reservoirs separated...Ch. 22.6 - (a) Suppose you select four cards at random from a...Ch. 22.7 - An ideal gas is taken from an initial temperature...Ch. 22.7 - True or False: The entropy change in an adiabatic...Ch. 22 - Prob. 1OQ Ch. 22 - Prob. 2OQ Ch. 22 - Prob. 3OQ Ch. 22 - Of the following, which is not a statement of the...

Ch. 22 - Prob. 5OQ Ch. 22 - Prob. 6OQ Ch. 22 - Prob. 7OQ Ch. 22 - Prob. 8OQ Ch. 22 - Prob. 9OQ Ch. 22 - Prob. 10OQ Ch. 22 - The arrow OA in the PV diagram shown in Figure...Ch. 22 - The energy exhaust from a certain coal-fired...Ch. 22 - Discuss three different common examples of natural...Ch. 22 - Prob. 3CQ Ch. 22 - The first law of thermodynamics says you cant...Ch. 22 - Energy is the mistress of the Universe, and...Ch. 22 - (a) Give an example of an irreversible process...Ch. 22 - The device shown in Figure CQ22.7, called a...Ch. 22 - A steam-driven turbine is one major component of...Ch. 22 - Discuss the change in entropy of a gas that...Ch. 22 - Prob. 10CQ Ch. 22 - Prob. 11CQ Ch. 22 - (a) If you shake a jar full of jelly beans of...Ch. 22 - What are some factors that affect the efficiency...Ch. 22 - A particular heat engine has a mechanical power...Ch. 22 - The work done by an engine equals one-fourth the...Ch. 22 - A heat engine takes in 360 J of energy from a hot...Ch. 22 - A gun is a heat engine. In particular, it is an...Ch. 22 - Prob. 5P Ch. 22 - Prob. 6P Ch. 22 - Suppose a heat engine is connected to two energy...Ch. 22 - Prob. 8P Ch. 22 - During each cycle, a refrigerator ejects 625 kJ of...Ch. 22 - Prob. 10P Ch. 22 - Prob. 11P Ch. 22 - Prob. 12P Ch. 22 - A freezer has a coefficient of performance of...Ch. 22 - Prob. 14P Ch. 22 - One of the most efficient heat engines ever built...Ch. 22 - Prob. 16P Ch. 22 - Prob. 17P Ch. 22 - Prob. 18P Ch. 22 - Prob. 19P Ch. 22 - Prob. 20P Ch. 22 - Prob. 21P Ch. 22 - How much work does an ideal Carnot refrigerator...Ch. 22 - Prob. 23P Ch. 22 - A power plant operates at a 32.0% efficiency...Ch. 22 - Prob. 25P Ch. 22 - Prob. 26P Ch. 22 - Prob. 27P Ch. 22 - Prob. 28P Ch. 22 - A heat engine operates in a Carnot cycle between...Ch. 22 - Suppose you build a two-engine device with the...Ch. 22 - Prob. 31P Ch. 22 - Prob. 32P Ch. 22 - Prob. 33P Ch. 22 - Prob. 34P Ch. 22 - Prob. 35P Ch. 22 - Prob. 36P Ch. 22 - Prob. 37P Ch. 22 - Prob. 38P Ch. 22 - Prob. 39P Ch. 22 - Prob. 40P Ch. 22 - Prob. 41P Ch. 22 - Prob. 42P Ch. 22 - A Styrofoam cup holding 125 g of hot water at 100C...Ch. 22 - Prob. 44P Ch. 22 - A 1 500-kg car is moving at 20.0 m/s. The driver...Ch. 22 - Prob. 46P Ch. 22 - Prob. 47P Ch. 22 - Prob. 48P Ch. 22 - Prob. 49P Ch. 22 - What change in entropy occurs when a 27.9-g ice...Ch. 22 - Calculate the change in entropy of 250 g of water...Ch. 22 - Prob. 52P Ch. 22 - Prob. 53P Ch. 22 - Prob. 54P Ch. 22 - Prob. 55P Ch. 22 - Prob. 56AP Ch. 22 - Prob. 57AP Ch. 22 - A steam engine is operated in a cold climate where...Ch. 22 - Prob. 59AP Ch. 22 - Prob. 60AP Ch. 22 - Prob. 61AP Ch. 22 - In 1993, the U.S. government instituted a...Ch. 22 - Prob. 63AP Ch. 22 - Prob. 64AP Ch. 22 - Prob. 65AP Ch. 22 - Prob. 66AP Ch. 22 - In 1816, Robert Stirling, a Scottish clergyman,...Ch. 22 - Prob. 68AP Ch. 22 - Prob. 69AP Ch. 22 - Prob. 70AP Ch. 22 - Prob. 71AP Ch. 22 - Prob. 72AP Ch. 22 - Prob. 73AP Ch. 22 - A system consisting of n moles of an ideal gas...Ch. 22 - A heat engine operates between two reservoirs at...Ch. 22 - Prob. 76AP Ch. 22 - Prob. 77AP Ch. 22 - Prob. 78AP Ch. 22 - A sample of an ideal gas expands isothermally,...Ch. 22 - Prob. 80AP Ch. 22 - Prob. 81CP

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Solution Summary: The author explains the overall efficiency of the two engine, which is e=e_1+ 2-

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