QUIZ October 17th - process The entropy of the gas...

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Name or UFID:_____________________________ Wednesday October 17th QUIZ 6 (10 points) Read each statement in the table below. Indicate a simple ‘yes’ or ‘no’ answer by a check mark in the appropriate column next to the statement. Then write a short statement to justify your answer to the second question. Yes No 1. An inventor claims to have developed an engine that takes in 10 8 J at a temperature of 400 K, rejects 4 × 10 7 J at a temperature of 200 K, and delivers 5.4 × 10 7 J of mechanical work. Would you advise investing money to put this engine on the market? 2. A certain quantity of gas undergoes a reversible isothermal
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Unformatted text preview: process. The entropy of the gas decreases. Does this violate the 2nd law? Briefly (in no more than 10 words) justify your answer below. √ You could imagine removing heat from an ideal gas, while simultaneously doing reversible configuration work on the gas, so that the change in internal energy is zero. In this situation, the temperature of the gas would remain unchanged, but its entropy decreased because heat flowed out. The entropy increase of the surroundings would then be equal and opposite to the entropy decrease of the gas. Another example would be if the gas condensed at constant temperature....
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This note was uploaded on 12/15/2011 for the course PHY 3513 taught by Professor Staff during the Fall '08 term at University of Florida.

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