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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionEasy2 minPYQ_2020

PhysicsEasysingle choice

One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to the total initial surface energy is

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Solution:

$U_{1} = 1000 \times 4 π r_{1}^{2} \times T$ $\frac{r _{2}}{r _{1}} = (1000)^{1/3} = 10$ $U_{2} = 4 π r_{2}^{2} T$ $\frac{U _{2}}{U _{1}} = \frac{4 π r _{2}^{2} T}{1000 \times 4 π r _{1}^{2} \times T} = \frac{100}{1000} = \frac{1}{10}$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2020

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