3. Calculate the time it takes for spherical glass particles in water to settle to a distance of 2 cm if the particle dispersion is: a) 0.1 µm-1; b) 1 µm-1;
c) 10 µm-1. The density of the dispersed phase and dispersion medium is 2.4 and 1.0 g/cm3, respectively. The viscosity of the dispersion medium is 1*10-3 Pa*s.

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