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A viscous force of 1.018 xx 10^(-7) N ac...

A viscous force of `1.018 xx 10^(-7)` N acting on a raindrop makes it fall through air with a terminal velocity of 1 `ms^(-1)`. If the viscosity of air is `0.018 xx 10^(-3)` PI, what is the radius of the raindrop?
Hint : Stokes' law

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