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Question

The diameter of the tap of a fire brigade pump is 5cm. Water is thrown by this pump at a horizontal speed of 18m/s on a wall. If water rebounds back with same velocity from the wall, then the force exerted by water on the wall will be:

A
2.35×105dyne
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B
5.76×106dyne
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C
6.36×107dyne
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D
12.72×107dyne
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Solution

The correct option is B 12.72×107dyne
From the concept,
F=2dAv2
d=1g/cm3
A=π4×52cm2
v=1800cm/s
So, F=12.72×107dyne

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