A pump is used to lift 600 kg of water from a depth of 75 m in 10 s.

Calculate:

(a) The work done by the pump,

(b) The power at which the pump works, and

(c) The power rating of the pump if its efficiency is 40%. (Take g = 10m s^-2).

An ox can apply a maximum force of 1000N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30ms^-1 while making its best effort. Calculate the power developed by the ox.

Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10ms^-1. Calculate the power exerted.

A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute.

Calculate:

(i) the work done, and

(ii) the power spent.