Atmospheric aerosols: a better way to write the maximum velocity is in terms of the density of water, p (what is p, in kg/m ? ) and the stokes drag formula, which gives the drag on the particle in terms of the viscosity of air: y = 6 ŋr, where n = 1.8e-5 kg/(m s) is the dynamic viscosity of air and r is the drop radius. a. write vmax in terms of p, g, n, and r. you will need to put m in terms of p and r. b. calculate vmax for a raindrop of radius r= 1.0 mm. roughly how many miles per hour is that? • how long does it take a 1.0 mm drop to reach its vmax ? c. calculate vmax for a tiny atmospheric drop (called an aerosol) of polluted water from a smokestack that has radius r = 5 um. put the answer in terms of meters/hour. d. based on your results, comment (1-2 sentences) on why the tiny aerosols drops of condensed pollution travel so far, and why a good rain cleans the air so well. kk2