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Work Energy and Power question

2010 · Q171
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Work Energy and Power question

2010 · Q171

NEETPhysicsWork Energy and PowerMCQ+4 / −1
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?
  1. A
    400 W
  2. B
    200 W
  3. C
    100 W
  4. D
    800 W
View written solutionFree

Correct answer: D

Here,

Mass per unit length of water, μ\mu μ = 100 kg/m

Velocity of water, v = 2 m/s

Power of the engine, P = μ\mu μv3 = (100 kg/m) (2 m/s)3

= 800 W

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