A machine can take out 1000 kg of mud hour from a dept of 100 m . If efficieny of the machine is 0.9 , calculate its power.

Calculate the input power of a machine if it can take out 500 kg of wet clay hour from a depth of 200 m with an efficiency of 0.7 .

A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump, assuming its efficiency as 50% will be

A machine gun fires 50-g bullets at a speed of 1000 m/s . The gunner , holding the machine in his hands , can exert an average force of 150 N against the gun . Calculate the maximum number of bullets he can fire one minute.

A crane lifts a mass of 100 kg to a height of 10 m in 20 s. The power of the crane is (Take g = 10 m s^(-2) )

A car manufacturer claims that his car can be accelerated from rest to a velocity of 10 m/s in 5s. If the total mass of the car and its occupants is 1000 kg, then the average horse power developed by the engine is

A car of mass 1000kg accelerates uniformly from rest to a velocity of 54km//h in 5 seconds. Calculate (i) its acceleration (ii) its gain in KE (iii) average power of the engine during this period.

An engine pumps up 1 quintal of coal from a coal mine 100 m deep in 0.5 seocnd. If its efficienty is 60% then the power of the engine is (take g=10m//s^(2))