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Question

Water from a hose pipe of radius 5cm strikes a wall normally at a speed of 5 ms1. The force exerted on the wall in newton is:

A
13.5π
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B
6.25π
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C
62.5π
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D
27π
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E
125π
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Solution

The correct option is C 62.5π
Given, Radius of hose pipe(r)=5cm
=5×102m
Speed of water(v)=5ms1
We know that, F=Av2ρ, where ρ=1000kg/m3 for water
F=πr2v2ρ
F=π(5×102)2(5)2×1000
F=62.5π.

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