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A metal ball of radius 2 mm and density `10.5 g//c.c.` is dropped in glycerine of coefficient of viscosity `9.8 "dyne "cm^(-2)s` and density `1.5 g//c.c.` find the terminal velocity of the ball.

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Here, `r= 2mm = 0.2 cm , upsilon=?, rho = 10.5 g//c.c. , sigma = 1.5 g//c.c. , eta = 9.8" dyne "cm^(-2) s`
Now `upsilon = (2 r^(2)(rho - sigma)g)/(9 eta) = (2 xx (0.2)^(2) xx (10.5 - 1.5) xx 980)/(9 xx 9.8) = 8 cm//s`.

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