A Heat Pump Extracts 7

question 53

Multiple Choice

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

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