*84. When an object moves through a fl uid, the fl uid exerts a viscous forceFBon the object that tends to slow it down. For a small sphere of radiusR, moving slowly with a speed v, the magnitude of the viscous force isgiven by Stokes’ law, F 5 6phRv, where h is the viscosity of the fl uid.(a) What is the viscous force on a sphere of radius R 5 5.0 3 1024m that is falling through water (h51.00 3 1023mPa ?s) when the sphere has a speed of 3.0 m/s? (b) The speed of the falling sphere increases until the viscous force balances the weight of the sphere. Thereafter, no net force acts on the sphere, and it falls with a constant speed called the “terminal speed.”If the sphere has a mass of 1.0 3 1025m kg, what is its terminal speed?

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.