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PhysicsFluidViscosityMedium2 minPYQ_2024

PhysicsMediumsingle choice

A small ball of mass $m$ and density $ρ$ is dropped in a viscous liquid of density $ρ_{0}$ . After sometime, the ball falls with constant velocity. The viscous force on the ball is :

Options:

Answer:

Solution:

$mg - F_{B} - F_{v} = ma$ $a = 0$ for constant velocity $m g - F_{B} = F_{v} F_{v} = m g - v ρ_{0} g = m g - \frac{m}{ρ} ρ_{0} g = m g (1 - \frac{ρ _{0}}{ρ})$

Stream:JEESubject:PhysicsTopic:FluidSubtopic:Viscosity

⏱ 2mℹ️ Source: PYQ_2024

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