An engine pumps water through a hosepipe. Water passes through the pipe and leaves it with a velocity of 2 m s - 1 . The mass per unit length of water in the pipe is 100 kg m - 1 . What is the power of the engine?

Question

An engine pumps water through a hosepipe. Water passes through the pipe and leaves it with a velocity of 2 m s - 1 . The mass per unit length of water in the pipe is 100 kg m - 1 . What is the power of the engine?, 400 W, 200 W, 100 W, 800 W

MARKS App · Accepted Answer

Here, Mass per unit length of water, μ = 100 kg m - 1 The velocity of water, v = 2 m s - 1 Power of the engine, P = μ v 3 = ( 100 kg m - 1 ) ( 2 m s - 1 ) 3 = 800 W

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