Serway_PSE_quick_ch22

Serway_PSE_quick_ch22 - Physics for Scientists and...

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Physics for Scientists and Engineers, 6e Chapter 22 – Heat Engines, Entropy, and the Second Law of Thermodynamics
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The energy input to an engine is 3.00 times greater than the work it performs. What is its thermal efficiency? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. 3.00 2. 1.00 3. 0.333 4. impossible to determine
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Equation 22.2 gives this result directly.
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The energy input to an engine is 3.00 times greater than the work it performs. What fraction of the energy input is expelled to the cold reservoir? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. 0.333 2. 0.667 3. 1.00 4. impossible to determine
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The work represents one third of the input energy. The remainder, two thirds, must be expelled to the cold reservoir.
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transmission can be converted to internal energy with an efficiency of 100%. By what factor does the cost of heating your home change when you replace your electric heating system with an electric heat pump that has a COP of 4.00? Assume that the motor running the heat pump is 100%
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This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_PSE_quick_ch22 - Physics for Scientists and...

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