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 7.8 ✕ 103 kg/m3, diameter 2.4 mm) is dropped in a container of motor oil. it takes 10 s to fall a distance of 0.75 m. calculate the viscosity (in kg/(m·s)) of the oil.

Asatellite that goes around the earth once every 24 hours iscalled a geosynchronous satellite. if a geosynchronoussatellite is in an equatorial orbit, its position appearsstationary with respect to a ground station, and it is known as ageostationary satellite find the radius rof the orbit of a geosynchronous satellite that circles the earth.(note that ris measured from the center of the earth, not the surface.) you mayuse the following constants: the universal gravitational constant g is 6.67 \times 10^{-11}\; {\rm n \; m^2 / kg^2}. the mass of the earth is 5.98 \times 10^{24}\; {\rm kg}. the radius of the earth is 6.38 \times 10^{6}\; {\rm m}.