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Grade: 12


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 plug which secures the pipe opening. Then the friction between the plug and pipe wall is:

9 years ago

Answers : (3)

Chetan Mandayam Nayakar
312 Points

pressure=dgh, d=1000kg/m^3, h=6m, g=9.8m/s^2, area=pi*r2,r=2cm,friction force=pressure*area

9 years ago
15 Points
Friction=force applied 
So, force applied= area×pressure 
R= d\2= 0.04/2=0.02m
Area= pie× R*2=3.14×0.02×0.02=0.001256m*2
And pressure=P2- P1=P0+ rho×g×h - P0= rho× g× h= 1000×10×6=60000
Therefore, force applied= friction = area× pressure
6 months ago
Vikas TU
12273 Points
Dear student 
Above ans are incorrect 
P = rho * g*h 
= 58800N/m^2
Splug = pi*R^2 
Magnitude of the frictional force b/n plug and pipe wall
F = S* P = 295.41N 
V = sqrt(2*g*h)
=7.67 m/s 
6 months ago
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