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A certain heat engine does 9.0 kJ of work and 7.00 kJ heat transfer occurs to the environment in a cyclical process. (a) What was

A certain heat engine does 9.0 kJ of work and 7.00 kJ heat transfer occurs to the environment in a cyclical process. (a) What was the heat transfer (in kJ) into this engine? :iw (b) What was the engine's efficiency (in percent)

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