Water is pumped from a lake to a storage tank 20 m above at a rate of

Question:

Water is pumped from a lake to a storage tank 20 m above at a rate of 70 L/s while consuming 20.4 kW of electric power. Disregarding any frictional losses in the pipes and any changes in kinetic energy, determine
(a) The overall efficiency of the pump€“motor unit and
(b) The pressure difference between the inlet and the exit of the pump.

Water is pumped from a lake to a storage