To contain a violent mob, the riot squad approaches with fire hoses. Suppose that the rate of flow of water through a fire

To contain a violent mob, the riot squad approaches with fire hoses. Suppose that the rate of flow of water through a fire hose is 24 kg/s, and the stream of water from the hose moves at 17 m/s. What force is exerted by such a stream on a person in the crowd? Assume that the water comes to a dead stop against the person's chest.

Solutions

Expert Solution

We have force F = Δp/Δt

= Δ(mv)/Δt

Here the velocity is constant.

Therefore F = v Δm/Δt

Given the speed of water v = 17 m/s

And the rate of flow of water Δm/Δt = 24 kg/s

Then force exerted by the stream of water on the person

F = (17m/s)(24kg/s)

= 408 N

Then force exerted by the stream of water on the person is 408 N.

Junaid answered 1 year ago

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