An air bubble of negligible weight having radius r rises steadily through a solution of density $\sigma$ at speed v. The coefficient of viscosity of the solution is given by :
Solution
<p>Air bubble moves with constant speed v. So net force = 0.</p>
<p>$\therefore$ Buoyant Force = Viscous force</p>
<p>$\Rightarrow {F_b} = {F_v}$</p>
<p>$\Rightarrow \sigma \times {4 \over 3}\pi {r^3}g = 6\pi nrv$</p>
<p>$\Rightarrow n = {{2\sigma {r^2}g} \over {9v}}$</p>
About this question
Subject: Physics · Chapter: Properties of Solids and Liquids · Topic: Elasticity
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