143. Solving a chemistry problem

3.17. Calculate the settling time of Al2O3 particles with a radius r = 10–7 m in a centrifugal field under the following conditions: density of the dispersed phase p = 3.9 * 10 ^ 3 kg / m3; the density of the dispersion medium p0 = 1 * 103 kg / m3; initial level of subsidence h1 = 0.05 m; final level h2 = 0.12 m; viscosity n = 1 * 10–3 Pa * s; centrifuge rotation speed n = 1800 rpm