Question

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

A
100 W
B
400 W
C
200 W
D
800 W

Solution

## The correct option is A $$100$$ Wmass per unit length of water,  $$\mu = 100kg/m$$velocity of water $$V=1\,m/s$$Power of the engine, $$p = \mu {v^3}$$$$= 100 \times {1^3}$$$$= 100W$$Hence, option $$A$$ is the correct answer.Physics

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