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Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionMedium2 minPYQ_2021

PhysicsMediumsingle choice

Work done in increasing the size of a soap bubble from radius of $3 cm$ to $5 cm$ in millijoule is nearly (surface tension of soap solution $= 0.03 Nm^{- 1}$ )

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Answer:

Solution:

$w = 8 π T (r_{2}^{2} - r_{1}^{2}) = 8 π \times 0.03 (25 - 9) \times 1 0^{- 4} = 0.384 π \times 1 0^{- 3} J = 0.384 π mJ \approx 0.4 π mJ$

Stream:MHT_CETSubject:PhysicsTopic:FluidSubtopic:Surface Tension

⏱ 2mℹ️ Source: PYQ_2021

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