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A fat hose pipe is held horizontally by a fireman. It delivers water through a constricting nozzle at 1 litre / sec. If by increasing the pressure, the water is delivered at 2 litre / sec, the fireman now has to

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Push forward four times as hard

Push forward eight times as hard

Push forward twice as hard

push backward four times as hard

answer is B.

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Detailed Solution

$F = {AV}^{2} ρ$

So when the discharge becomes two times, force on the nozzle becomes four times and this force acts in the forward direction . So the fireman has to push backward 4 times as hard.

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