A 6 ft high column is made from a hollow steel shell filled with concrete. The steel shell cross-section is 6 in x 6 in square with a wall thickness of 1⁄2 in. The column is subjected to a load of 1,000 kips. ES = 29x106 psi, and EC = 3.5x106 psi. a. Calculate the load supported by the steel and by the concrete. b. Calculate the stress in the steel and the stress in the concrete. c. Calculate the deflection of the column.

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump