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Physics Question on Relative Velocity

A rain drop of radius 0.3 mm has a terminal velocity in air 1 ms-1. The viscosity of air is 18×10−518×10^{-5} poise. Find the viscous force on the rain drops.

A

2.05×10−7 N2.05 \times 10^{-7}\ N

B

1.018×10−7 N1.018 \times 10^{-7}\ N

C

1.05×10−7 N1.05 \times 10^{-7}\ N

D

2.058×10−7 N2.058 \times 10^{-7}\ N

Answer

1.018×10−7 N1.018 \times 10^{-7}\ N

Explanation

Solution

The correct option is (B): 1.018×10−7 N1.018 \times 10^{-7}\ N.