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Chapter 15: Q27CQ (page 549)
Can you cool a kitchen by leaving the refrigerator door open?
No, it is not possible to make a kitchen cool by leaving the door of a refrigerator open.
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Why鈥攐ther than the fact that the second law of thermodynamics says reversible engines are the most efficient鈥攕hould heat engines employing reversible processes be more efficient than those employing irreversible processes? Consider that dissipative mechanisms are one cause of irreversibility.
Think about the drinking bird at the beginning of this section (Figure 15.21). Although the bird enjoys the theoretical maximum efficiency possible, if left to its own devices over time, the bird will cease 鈥渄rinking.鈥� What are some of the dissipative processes that might cause the bird鈥檚 motion to cease?
With of heat transfer into this engine, a given cyclical heat engine can do only role="math" localid="1668687707360" of work (a) What is the engine鈥檚 efficiency (b) How much heat transfer to the environment takes place.
Give an explanation of how food energy (calories) can be viewed as molecular potential energy (consistent with the atomic and molecular definition of internal energy).
Grocery store managers contend that there is less total energy consumption in the summer if the store is kept at a low temperature. Make arguments to support or refute this claim, taking into account that there are numerous refrigerators and freezers in the store.
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