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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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  1. 23 November, 11:01
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    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
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