THE WATER Pump
Classical Mechanics
Level
pending
A pump taking water from a Large reservoir, is used to spray a Jet of water with speed 20 m/s and radius 0.05m , from a nozzle level with the surface of the reservoir. Calculate the power of the pump
The answer is 31.4.
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1 solution
V=AxS Where V is the volume and A is the area of circle and S is the speed V= .0157 cubic metre 1cubic metre = 1000kg 0.157cubic metre = .157x1000 =157kg Gain in kinetic energy =.5x157x20x20 =31400 J Power= workdone/time =31400/1 =31400 W =31.4kW