A small ball of mass $\mathrm{M}$ and density $\rho$ is dropped in a viscous liquid of density $\rho_{0}$. After some time, the ball falls with a constant velocity. What is the viscous force on the ball ?

Question

$\mathrm{F}=\mathrm{Mg}\left(1-\frac{\rho_{\mathrm{O}}}{\rho}\right)$

$\mathrm{F}=\mathrm{Mg}\left(1+\frac{\rho}{P_{o}}\right)$

$\mathrm{F}=\mathrm{Mg}\left(1+\frac{\rho_{\mathrm{o}}}{\rho}\right)$

$F=M g\left(1 \pm \rho \rho_{0}\right)$

Solution

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