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A complete machine is designed to obtain an efficiency of 65.0% when operating between two energy stores. a) If the temperature of the cold tank

A complete machine is designed to obtain an efficiency of 65.0% when operating between two energy stores. a) If the temperature of the cold tank is 20.0 C, what must be the temperature of the hot tank? b) the real efficiency of the machine can be equal to 65.0%?

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