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Water stands at a depth of 15 m behind a...

Water stands at a depth of `15 m` behind a reservoir dam. A horizontal pipe `4 cm` in diameter passes through the dam `6 m` below the surface of water as shown. There is a plug which secures the pipe opening. Then find the friction between the plug and pipe wall.

Text Solution

Verified by Experts

As plug secures the pipe opening the force of friction between plug and pipe wall
`F=A(p_(2)-p_(1))`
But `p_(1)=p_(2)` and `p_(2)=p_(0)+hrhog`
`F=Ahrhog`
`F=pi(2xx10^(-2))^2xx6xx10^(3)xx9.8implies F=74n`
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