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

Physics

Wright

3 February, 07:40

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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Cassandra Mathews · 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