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Physics - Fluid Question with Solution | TestHub

PhysicsFluidViscosityEasy2 minPYQ_2021

PhysicsEasysingle choice

The speed of a ball of radius $2 cm$ in a viscous liquid is $20 cm / s$ . What will be the speed of a ball of radius $1 cm$ in same liquid?

Options:

Answer:

Solution:

Terminal velocity $V \propto r^{2}$ $∴ \frac{V _{2}}{V _{1}} = (\frac{r _{2}}{r _{1}})^{2} = (\frac{1}{2})^{2} = \frac{1}{4} ∴ V_{2} = \frac{V _{1}}{4} = \frac{20}{4} = 5 cm / s$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Viscosity

⏱ 2mℹ️ Source: PYQ_2021

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