Stokes Law

A small sphere of radius falls from rest in a viscous liquid. As a result, heat is produced due to the viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to:

1.		2.
3.		4.

The velocity of a small ball of mass and density , when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is then the viscous force acting on the ball will be:
1.
2.
3.
4.