A Heat Engine Operates Between a Hot Reservoir at 1500

A heat engine operates between a hot reservoir at 1500 K and a cold reservoir at 500 K.During each cycle,1.0 × 10⁵ J of heat is removed from the hot reservoir and 5.0 × 10⁴ J of work is performed.
-A heat pump extracts 7.0 × 10⁶ J of heat per hour from a well at 280 K and delivers its output heat into a house at 320 K.If the heat pump uses an ideal Carnot cycle in its operation,what minimum work must be supplied to the heat pump per hour?

A) 8.6 × 10⁵ J
B) 8.0 × 10⁶ J
C) 7.7 × 10⁶ J
D) 1.0 × 10⁶ J
E) 4.7 × 10⁷ J

Correct Answer:

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