G A composite beam is built of a wood member having cross-sectional dimensions 150mm x 250mm and two steel plates of cross-sectional dimensions 50mm x 150mm. Determine the maximum stress in the steel and the maximum stress in the wood if the beam is subjected to a bending moment M of 100 kN-m. The moduli of elasticity for the wood are steel are Ew

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