Physics
posted by Maggie .
Small, slowly moving spherical particles experience a drag force given by Stokes’ law: where r is the radius of the particle, is its speed, and ç is the coefficient of viscosity of the fluid medium. (a) Estimate the terminal speed of a spherical pollution particle of radius 1.00 x 105 m and density of 2000 kg/m3. (b) Assuming that the air is still and that ç is 1.80 x 05 N · s/m2, estimate the time it takes for such a particle to fall from a height of 100 m.
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