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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

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

Answer: (A)

Solution

The mass flow rate is (mass per unit length) × v = 100 × 2 = 200 kg/s. Power = (rate of KE delivered) = ½(dm/dt)v² —

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Question ID VK-153978