A rain drop of radius 0.3 mm falling vertically downwards in air has a terminal velocity of 1 m/s. The viscosity of air is 18 x 10-5 poise. The viscous force on the drop is

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101.73 × 10-4 dyne

101.73 ×10-5 dyne

16.95×10-5 dyne

16.95× 10-4 dyne

answer is A.

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Detailed Solution

Viscous force = 6πηrv = 6πηrv = 6π×18×10-5×0.03×100 = 101.73 × 10-4 dyne

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