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Concept explainers
(a)
The efficiency of reversible engine.
(a)
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Answer to Problem 74P
Efficiency is
Explanation of Solution
Average temperature difference between top and bottom is
Write the equation to calculate the efficiency.
Here,
Conclusion:
Substitute
Therefore, the efficiency is
(b)
The cubic meters of water used by
(b)
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Answer to Problem 74P
Water used by heat engine is
Explanation of Solution
Average temperature difference between top and bottom is
Write the equation to find the power supplied to the town.
Here,
Write the equation to find
Here,
Rewrite the equation for
Conclusion:
Substitute
Therefore, the water used by heat engine is
(c)
Check whether the lake can supply enough heat energy to meet the town’s energy need.
(c)
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Answer to Problem 74P
Yes. Lake can supply enough heat energy to meet the town’s energy need.
Explanation of Solution
Average temperature difference between top and bottom is
Write the equation to find the power delivered by sun.
Here,
Write the equation to calculate the power of engine.
Here,
Conclusion:
Substitute
Substitute
It can be seen that
Therefore, Yes. Lake can supply enough heat energy to meet the town’s energy need.
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Chapter 15 Solutions
Physics
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