30. A metal sphere of radius 1 mm and mass 50 mg falls
vertically in glycerine. Find (a) the viscous force exerted
by the glycerine on the sphere when the speed of the
sphere is 1 cm s', (b) the hydrostatic force exerted by
the glycerine on the sphere and (c) the terminal velocity
with which the sphere will move down without
acceleration. Density of glycerine = 1260 kg m and its
coefficient of viscosity at room temperature = 8:0 poise.
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