Viscosity — UPSC Physics Optional CSE 1998 Paper I

A steel ball 1.00\text{mm} in diameter at constant speed of 0.176\text{ cm s}^{-1} in a large vessel filled with oil. Calculate the dynamic viscosity of oil. Given density of steel = 7700\text{ kg m}^{-3} and that of oil = 900\text{ kg m}^{-3}. Deduce the mathematical relation needed for the calculation.