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 bearing (density 7.7 × 103 kg/m3, radius 1.25 mm) is dropped in a container of motor oil. It takes 12.5 s to fall a distance of 0.45 m. Calculate the viscosity of the oil assuming the ball achieves terminal velocity immediately.
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