Determine the estimated cost of drywall required to cover the ceilings and walls of the 25 ft x 47 ft house. assume that the interior wall height is 8 ft, and assume that the interior partitions total 157 linear feet. ignore all openings. the unit cost is $0.46/sq. ft.

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.