A heat pump with a coefficient of performance of 3.8 provides energy at an average rate of 75,000 kJ/h to maintain a building at 21°C on a day when the outside temperature is 0°C. If electricity costs 8 cents per
(a) Determine the actual operating cost and the minimum theoretical operating cost, each in $/day.
(b) Compare the results of part (a) with the cost of electricalresistance heating.