Comparing these two structural elements: Select one or more: a. The bending stress in the upper structural element is negligible compared to the bending stress in the lower structural element. b. The Axial stress in the upper structural element is more than a 100 times the bending stress in the lower structural element. c. The bending stresses in the lower structural element are about 35 times larger than the axial stresses in the upper structural element. d. The bending stress in the upper structural element is severe. e. The difference in the worst stress in each of the two elements is not significant.

Aheat pump with refrigerant-134a as the working fluid is used to keep a space at 25°c by absorbing heat from geothermal water that enters the evaporator at 500c at a rate of 0.065 kg/s and leaves at 40°c. the refrigerant enters the evaporator at 20°c with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. the refrigerant loses 300 w of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4 mpa at the same entropy as the inlet. determine: (a) the degrees of subcooling of the refrigerant in the condenser, b)-the mass flow rate of the refrigerant . (c) the heating load and the cop of the pump, and d)-the theoretical minimum power input to the compressor for the same heating load.