A motor is used to deliver water at a certain rate through a given horizontal pipe. To deliver n-times the water through the same pipe in the same time the power of the motor must be increased as follows.

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n times

n3 times

n2 times

n4 times

answer is B.

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Detailed Solution

Power of the motor = P = A V3 ρ New power = P' =A( nv)3ρ= n3 A V3ρ= n3P

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