A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

Question

Ellie Beasley

Physics

23 November, 10:43

A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, assuming the water doesn't bounce back?

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Answers (1)

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Miriam Walker · Answer 1

Minimum velocity is 25m/s

Explanation:

Given force F = 1000N

Mass flow rate m/t = 40kg/s

Velocity=v

Recall Newton second law of motion F = MV/t

1000=40v

V=1000/40

25m/s