Question 3. [20 Points] The "Falling Ball Method" is used to measure the viscosity of a liquid. The liquid is placed in the glass container. It takes 6.4 s for the steel ball with a diameter of 5.00 mm to travel downward 200 mm in the liquid. The density of the steel ball is 7840 kg/m, and the density of the liquid is 1200 kg/m. Your task is to work out the viscosity of liquid. Note that if you make assumptions in your calculations, those assumptions must be clearly stated and verified whenever possible. Sphere Meter Scale Liquid Container Viscous Liquid. Steel ball Sphere Retrieving Device Constant temperature bath Figure 3. System Sketch for Question 3 - A falling ball viscometer