1.

Water is pumped out of a well 10 m deep by mean of a pump rated at 10 kW . Find the efficient of the motor if 4200 kg of wateris pumped out every minutes . Take g=10 ms ^(-2).

Answer»

SOLUTION :INPUT power `=10KW`
Out PUT power `=W/t=(mgh)/t=7KW`
`:.` Effiiency `=("Output power")/("Input power")xx100=70%`


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