A small ball of mass m and density \rho is dropped in a viscous li | Filo
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Class 11

Physics

Mechanics

Mechanical Properties of Fluids

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A small ball of mass m and density is dropped in a viscous liquid having a density . After some time, the ball falls with a constant velocity. Calculate viscous force acting on the ball.

Solution: Volume of the ball, ; a mass of liquid displaced by the ball.

= density of ball
When the ball falls with a constant velocity
⇒ viscous force = effective weight of the ball or
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