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Power
Question

A 10 HP motor pumps out water from a well of depth 20m and fills a water tank of volume 22380 litre at a height of 10m from the ground. The running time of the motor to fill the empty water tank is (g=10ms2)

Moderate
Solution

Volume of water to raise = 22380 l = 22380×10–3m3
P=mght=Vρghtt=VρghP
t=22380×103×103×10×3010×746=15min

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