A6-in. insulated frame wall of a house has an average thermal conductivity of 0.04 btu/h·ft·°r. the inner surface of the wall is at 68°f, and the outer surface is at 40°f. the temperature varies linearly through the wall. determine at steady state the rate of heat transfer through the wall, in btu/h. if the wall is 20 ft × 10 ft, determine the total amount of energy transfer in 10 hours, in btu.

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm