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9-1.Fluid Mechanics
medium
A cylindrical vessel filled with water is released on an inclined surface of angle $\theta$ as shown in figure.The friction coefficient of surface with vessel is $\mu( < \tan \theta)$.Then the contact angle made by the surface of water with the incline will be

A
$\tan ^{-1} \mu$
B
$\theta-\tan ^{-1} \mu$
C
$\theta+\tan ^{-1} \mu$
D
$\cot ^{-1} \mu$
Solution

(a)
Figure shows forces acting on a particle on the surface, with respect to vessel.
Standard 11
Physics