If a particle moves with uniform speed along a circular path, then which of the following is true for that particle. a)-it has normal acceleration only b)-it has tangential acceleration only. c)-it has both tangential and normal acceleration. d)-it has no acceleration.

Around steel bar, made from material with a yield stress of 750mpa, is loaded so that it has stresses co locations of maximum normal stress and maximum shear stress. use maximum shear stress and maximum distortion energy theories to calculate the safety factors for initial yielding failures.

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.

Air flows over a flat plate at a velocity of 3 m/sec and ambient conditions are, the pressure is 761 mm of hg and tempera- ture is 15°c. the plate is maintained at 85°c. if the length of the plate is 100 cm along the flow of the air, find out the heat lost by 50 cm of the plate which is measured from the trailing edge. plate width is 50 cm.