4.46 As shown in Fig. P4.46, a

pump operating at steady state

draws water from a pond and

delivers it though a pipe whose

exit is 90 ft above the inlet. At

the exit, the mass flow rate is 10

lb/s. There is no significant

change in water temperature,

pressure, or kinetic energy from

inlet to exit. If the power

required by the pump is 1.68 hp,

determine the rate of heat

transfer between the pump and

its surroundings, in hp and

Btu/min. Let g = 32.0 ft/s².