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A Carnot engine operates between a high-tempera... - SS1 Physics Heat and Thermodynamics II Question

A Carnot engine operates between a high-temperature reservoir at 400 K and a low-temperature reservoir at 100 K. The heat input to the engine is 800 J. What is the heat output of the engine? 

Carnot efficiency = 1 - (Tlow / Thigh)

           Carnot efficiency = 1 - (100 K / 400 K) = 0.75

           Heat output = (1 - Carnot efficiency) x Heat input

           Heat output = (1 - 0.75) x 800 J = 0.25 x 800 J = 200 J

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