Stokes flow past a sphere – falling ball viscometer.You have already measured the density of an unknown fluid to be 0.78 g/ml. You with to estimate the viscosity of the fluid by measuring the time it takes for a brass ball bearing (D= 2 mm) to fall 25 cm through the fluid. Several experiments indicate that this time is about 2.8 s. Which of the following is the best estimate of the fluid viscosity?

MCQs on how fluids (gases and liquids and a few other materials) respond to forces, exert forces, and move from one place to another (their mechanics).