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Question

In a winter season, a heat pump is used to warm the room. A heat pump works 60 J on the pump while it absorbs 90 J of heat. How much heat is delivered to the house?

A
5,400 J.
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B
150 J.
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C
30 J.
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D
1.5 J.
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E
0.67 J.
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Solution

The correct option is B 30 J.
Since 60 J of the 90 J of heat are used to do work, there are only 30 joules of heat left to deliver to the house, i.e, 90 J60 J=30 J

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