Question: A reversible engine working between two reservoirs at temperatures Th and Tc has an efficiency of 30%. Working as a heat engine, it gives off

A reversible engine working between two reservoirs at temperatures Th and Tc has an efficiency of 30%. Working as a heat engine, it gives off 140 J of heat to the cold reservoir. A second engine working between the same two reservoirs also gives off 140 J to the cold reservoir. Show that if the second engine has an efficiency greater than 30%, the two engines working together would violate the heat-engine statement of the second law.

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