The viscous drag acting on a metal sphere of diameter $1 \mathrm{~mm}$, falling through a fluid of viscosity $0.8 \mathrm{~Pa}$ s with a velocity of $2 \mathrm{~m} \mathrm{~s}^{-1}$ is equal to :

Question

$15 \times 10^{-3} \mathrm{~N}$

$30 \times 10^{-3} \mathrm{~N}$

$1.5 \times 10^{-3} \mathrm{~N}$

$20 \times 10^{-3} \mathrm{~N}$

Solution

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