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A Carnot heat engine receives 550 kJ of heat from a source of unknown temperature and rejects 250 kJ of it to a sink

A Carnot heat engine receives 550 kJ of heat from a source of unknown temperature and rejects 250 kJ of it to a sink at 32 C. Determine (a) the thermal efficiency of the heat engine and (b) the temperature of the source (in Celsius)?

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