An electric pump is used to full an overhead tank of capacity 9m^3 kept at a height of 10 m above the ground. If the pump takes 5 minutes to fill the tank by consuming 10 KW power , What is the efficiency of the engine ?

The power of a water pump is 2 Kw . If g=10 m//s^2 . What is the amount of water it can raise in 1 minute to a height of 10 m?

A breaker of circular cross section of radius 4cm is filled with mercury up to a height of 10cm . Find the force exerted by the mercury on the bottom of the beaker . The atmosphere pressure = 10Nm^-2 . Density of mercury =13600kg m^-3 , Take g= 10m/s^2 .

A tank of 2xx2xx3 is to be filled with water from a well of average depth 10 m. The work done will be