The enthalpy of the water entering an actual pump is 500 kj/kg and the enthalpy of the water leaving it is 550 kj/kg. the pump has 98% efficiency, what would have been the enthalpies at the inlet and outlet if the pump was 100% efficient?

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3