The second law of thermodynamics imposes what limit on the efficiency of a heat engine? The second law of thermodynamics imposes what limit on the efficiency of a heat engine? A heat engine must deposit some energy in a cold reservoir. The energy a heat engine must deposit in a cold reservoir is greater than or equal to the energy it extracts from a hot reservoir. The energy a heat engine must deposit in a cold reservoir is greater than or equal to the energy extracted as useful work.
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