1.

Calculate the viscous force on a ball of radius 1mm moving through a liquid of viscosity 0.2 Nsm-2 at a speed of 0.07 ms-1

Answer»

Radius of the ball (a) = 1mm = 1 × 10-3

Co-effecient of viscosity of liquid (η) = 0.2 Nsm-2 

Speed of the ball (v) = 0.07 ms-1 

According to Stoke’s law 

Viscous force F = 6 π η av 

= 6 × 3.14 × 1 × 10-3 × 0.2 × 0.07

= 0.26376 × 10-3 = 2.64 × 10-4 N



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