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Why is it difficult for a firefighter to hold a hose that ejects large amounts of...

Why is it difficult for a firefighter to hold a hose that ejects large amounts of water at a high speed?

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Answer #1

When a large amount of water(which means the mass of water exiting the hose) exits the hose at high speed, the momentum (p=mv)of the water is very high. By conservation of momentum, the fireman who is holding the hose also experiences a very high momentum shift in small time. This means the water provides a large impulse back on the hose, which makes it hard to hold for the fireman.

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