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  4. The terminal velocity of small-sized spherical body of radius r falling vertically in a viscous liquid is given by the following proportionality

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Q. The terminal velocity of small-sized spherical body of radius r falling vertically in a viscous liquid is given by the following proportionality

Mechanical Properties of Fluids

Solution:

According to formula
$v=\frac{2r^2(\rho - \sigma)g}{9\eta}$
So, $v\propto r^2$