mines Derive an equation relating the settling velocity of sand particles to particle diameter with the following assumptions: specific gravity (S.G.) of sand = 2.65, shape factor () = 0.90, and temperature of 20C ( = 1.002 103 kg/(ms) and = 998.2 kg/m3). Assume that CD = 18.5/(NR)0.6 for Reynolds number = 1.9 to 500 (Rich, 1971, p. 86)