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Physics - Fluid Question with Solution | TestHub

PhysicsFluidViscosityEasy2 minPYQ_2020

PhysicsEasysingle choice

Terminal speed of $2 cm$ radius ball in a viscous liquid is $20 c m s^{- 1}$ . Then the speed of $1 cm$ radius ball in the same liquid is

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Answer:

Solution:

Terminal velocity, $v = \frac{2 r^{2} (ρ - ρ_{0}) g}{9 η}$

$ie, v \propto r^{2}$

$∴ \frac{v_{1}}{v} = \frac{r_{1}^{2}}{r^{2}}$

Or $v_{1} = v {(\frac{r_{1}}{r})}^{2}$

$= 20 {(\frac{1}{2})}^{2} = 5 cm s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:FluidSubtopic:Viscosity

⏱ 2mℹ️ Source: PYQ_2020

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