A heat pump is used to keep a house warm at 22 degrees Celsius.

(a) How much work is required of the pump to deliver 2900 J of heat into the house if the outdoor temperature is 0 degrees Celsius? Assume a COP of 3.0.

(b) How much work is required of the pump to deliver 2900 J of heat into the house if the outdoor temperature is -15 degrees Celsius? Assume a COP of 3.0.

(c) How much work is required of the pump to deliver 2900 J of heat into the house if the outdoor temperature is 0 degrees Celsius? Assume an ideal (Carnot) coefficient of performance COP = TH/(TH−TL).

(d) How much work is required of the pump to deliver 2900 J of heat into the house if the outdoor temperature is -15 degrees Celsius? Assume an ideal (Carnot) coefficient of performance COP = TH/(TH−TL).

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