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Q.

A small sphere of mass 6 mg is falling through a viscous liquid of specific gravity 0.8 with constant velocity of 2 cm/s. If the specific gravity of the material of the sphere is 2.4, the viscous force acting on it is

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a

information is not sufficient to find the viscous drag

b

4 dyne

c

6 dyne

d

12 dyne

answer is B.

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Detailed Solution

detailed_solution_thumbnail

At terminal velocity, 

Viscous force FD=mg−mσ.ρ.g=mg1−ρσ

=6×10−6×10×1−0.82.4N

=4×10−5N=4 dyne

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