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A heat engine is in its normal mode of operation, so that its internal energy does...

A heat engine is in its normal mode of operation, so that its internal energy does not change. It takes in 85 Joules from the hot reservoir (at 600 K), expels 65 Joules to the cold reservoir (at 300 K), and produces 25 Joules of work. Which statement is true, regarding this engine?

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