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Q.

A motor is used to lift water from a well of depth 10m and to fill a water tank of volume 30m3 in 10 minutes. The tank is at a height of 20m above ground. If 20% of energy is wasted, the power of the motor is (in kW)

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a

18.75

b

20

c

22.5

d

37.5

answer is A.

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Detailed Solution

80100P=mght⇒80100P=Vρght

80100P=30×103×10×3010×60

P=18.75 kW

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