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A spherical drop of oil falls at a const...

A spherical drop of oil falls at a constant speed of `4 cm//s` in steady air. Calculate the radius of the drop. The density of the oil is `0.9 g//cm^3`, density of air is `1.0 g//cm^3` and the coefficient of viscosity of air is `1.8 xx 10^-4poise`, (`g = 980 cm//s^2`)

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