Stokes’ law describes sedimentation of particles in liquids and can be used to measure viscosity. Particles in liquids achieve terminal velocity quickly. One can measure the time it takes for a particle to fall a certain distance and then use Stokes’ law to calculate the viscosity of the liquid. Suppose a steel ball 3? bearing (density 7.8×10? kg/m3 , diameter 3.0 mm ) is dropped in a container of motor oil. It takes 12 s to fall a distance of 0.60 m. Calculate the viscosity of the oil.

Step-by-step solution Step 1 of 3 The metal ball released in the water reaches the terminal velocity in a very short time. So we can assume its motion to be moving with constant terminal velocity. The distance traveled The time taken Terminal velocity The terminal velocity is 0,05m/s Step 2 of 3 The mass of the steel ball The radius of the ball The density of the ball The volume of the spherical ball The mass of the ball is;