Problem 4 A cylinder of diameter d, length 1, and density p is falling inside a pipe (diameter D) filled with oil, at a constant velocity Van. The small space between

the cylinder and the pipe is lubricated with the oil of viscosity Assume the velocity profile to be linear in the thin film of oil. (a) Find the relation between and all the other variables. (b) Given d = 48 mm, D = 52 mm, 1 = 150 mm, p= 2450 kg/m³, and Va 0.8 m/s, compute Pipe -On -Cylinder