Kane was given money by his wife to buy a new refrigerator. He lost all his money in gambling. He decides to use an old Carnot heat engine as a refrigerator. When used as a refrigerator, 70 J of energy is absorbed from the reservoir at lower temperature and the work done on the system is 14 J. What is the efficiency of the Carnot heat engine?

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Explanation:

the answer is d. 4

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dopamine..

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