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Let,

Coefficient of viscosity of liquid = eta
Radius of sphere = a
velocity of sperical body = v

Dimensionally it can be proved that

F = k eta*a*v

Experimentally Stoke found that

k = 6*pi

therefore, F = 6*pi*eta*a*v

This is Stoke's law.

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Q: Find the radius of a particle given the density and velocity according to stoke's law?
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