Fluid MechanicsMedium
Question
A rain drop of radius 0.3 mm has a terminal velocity in air 1 m/s. The viscosity of air is 18 × 10-5 poise. The viscous force on it is : -
Options
A.101 . 73 × 10-4 dyne
B.101 . 73 × 10-5 dyne
C.16.95 × 10-5 dyne
D.16.95 × 10-4 dyne
Solution
Viscous force = 6πηrv
= 6 × 3.14 × 18 × 10-5 × 0.3 × 10-1 × 102
= 101.73 × 10-4 dyne
= 6 × 3.14 × 18 × 10-5 × 0.3 × 10-1 × 102
= 101.73 × 10-4 dyne
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