Explain why it is difficult for a fireman to hold a hose which ejects large amount of water at a high velocity.
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As a large amount of water is coming out, you can consider the situation as v dm/dt = F
where v is velocity and dm/dt is rate at which water is coming out
where v is velocity and dm/dt is rate at which water is coming out
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When a fire hose pipe ejects large amount of water in the forward direction at a high velocity, then the forward going stream of water exerts a backward reaction force due to which the hose pipe tends to go backward and slips from the hands of fireman. This backward movement of hose pipe makes it difficult for a Fireman to hold a hose pipe. And the Fireman has to hold the hose pipe strongly.
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