12.15 A centrifugal radial water pump has the dimensions shown in Figure. The volume rate of flow is 0.25 ft/s, and the absolute inlet velocity is directed radially outward. The angular velocity of the impeller is 960 rpm. The exit velocity as seen from a coordinate system attached to the impeller can be assumed to be tangent to the vane at its trailing edge. Calculate the power required to drive the pump. Water density is 1.94 slug/ft. Liven: 55 + V 960 rpm m Q = 0.25 ft/s 11 in. 3 in. 0.75 in. w=460rpm