Alight horizontal spring has a spring constant of 138 n/m. a 3.85 kg block is pressed against one end of the spring, compressing the spring 0.103 m. after the block is released, the block moves 0.290 m to the right before coming to rest. the acceleration of gravity is 9.81 m/s 2 . what is the coefficient of kinetic friction between the horizontal surface and the block?

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).