A heat engine with a thermal efficiency (th) of 35% is used to drive a refrigerator having

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A heat engine with a thermal efficiency (ηth) of 35% is used to drive a refrigerator having a COP of 4.
(a) What is the heat input to the engine for each MJ removed from the cold region by the refrigerator?
(b) If the system is used as a heat pump, how many MJ of heat would be available for heating for each MJ of heat input into the engine?
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