1.

A pump raises 50 litre of water through a height of 25 m in 5 s. Calculate the power of the pump required.

Answer»

Power = work done/ time

mass of WATER = 50kg as density of water is 1 kg/litre or 1g/ml

now in this CASE work done = change in potential energy

work done = mgh - 0

= 50 * 10 *25 J = 12500 J

power = 2500 W



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