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NEET 2010
Exam
NEET
Year
2010
Subject
Physics
Chapter
Center of Mass, Momentum and Collision

NEET 2010 · Physics · Center of Mass, Momentum and Collision

An engine pumps water through a hose pipe. Water passes through the...

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 ms−12 \mathrm{~ms}^{-1}. The mass per unit length of water in the pipe is 100kgm−1100 \mathrm{kgm}^{-1}. What is the power of the engine?

Options

  1. A400 W400 \mathrm{~W}
  2. B200 W200 \mathrm{~W}
  3. C100 W100 \mathrm{~W}
  4. D800 W800 \mathrm{~W}

Correct answer

D. 800 W800 \mathrm{~W}

Step-by-step solution

 Power =μv3=ml×v3=100×(2)3=800W\begin{aligned}\text{ Power }& =\mu \mathrm{v}^3=\frac{\mathrm{m}}{\mathrm{l}} \times \mathrm{v}^3 \\ & =100 \times(2)^3=800 \mathrm{ W} \end{aligned}
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