Question: One way of measuring fluid viscosity is to use a falling ball viscometer in which a spherical ball of known density is dropped into a fluid-filled graduated cylinder and the time of fall for the ball for a specified distance is recorded. A spherical ball, 5 mm in diameter, has a density of 1000 kg/m3. It falls through a liquid of density 910 kg/m3 at 25C and travels a distance of 10 cm in 1.8 min. Determine the viscosity of the liquid.