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Q.

A metal sphere of radius 1 mm and mass 50 mg falls vertically in glycerine, the viscous force exerted by the glycerine on the sphere when the speed of the sphere is 1ms–1 is (density of glycerine is 1260kg/m3 coefficient of viscosity at room temperature is 8 poise)

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a

0.5×10−4N

b

150×10−4N

c

3×10−4N

d

4.5×10−4N

answer is B.

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Detailed Solution

FV=6πηrv=6π×(0.8) ×10-3×1≅1.5×10-2N

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