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Physics - Fluid Question with Solution | TestHub

PhysicsFluidViscosityMedium2 minPYQ_2022

PhysicsMediumsingle choice

A small ball of mass $M$ , radius $R$ and density $ρ$ moves with terminal velocity through a container filled with glycerine of density $σ$ . The viscous force acting on the ball is ( $g =$ gravitational acceleration)

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Answer:

Solution:

Considering force balance on the ball falling with terminal velocity: $F_{v} + σV g = ρ V g$ where $F_{v}$ is the viscous force, $V$ is the volume of the ball.Taking the ratio of equation (1) and (2): $F_{v} = M g (1 - \frac{σ}{ρ})$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Viscosity

⏱ 2mℹ️ Source: PYQ_2022

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