A heat engine is taking in 400 j from a hot reservoir that, Physics

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A heat engine is taking in 400 j from a hot reservoir that

A heat engine is taking in 400 J from a hot reservoir that is at 20 degrees Celsius. It expels heat to a cold reservoir at 0 degrees Celsius> The engine does 300J of work. What is the actual efficiency of the engine? How much heat is expelled to the cold reservoir? What is the ideal efficiency of the engine? Is this engine possible?

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