Question: A reversible heat engine operates between a hot reservoir at 4 8 0 K and a cold reservoir of unknown temperature. After 5 min, the

A reversible heat engine operates between a hot reservoir at 480 K and a cold reservoir of unknown temperature. After 5 min, the engine has absorbed 1020 J of energy from the hot reservoir and expelled 400 J of energy to the cold reservoir. What is the temperature of the cold reservoir?

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