Problem 02.121 - A shaft rotating in a bearing with variable diameter A shaft with a diameter of D = 80 mm and a length of L = 400 mm, shown in the figure below, rotates with a constant angular speed of n = 1600 rpm in a bearing with variable diameter. The clearance between shaft and bearing, which varies from h1 = 1.2 mm to h2 = 0.4 mm, is filled with a Newtonian lubricant whose dynamic viscosity is 0.1 Pa⋅s. Determine the torque required to maintain the motion. The torque required to maintain the motion is N·m.