Chapter 2, Problem 121P

Reconsider Prob. 2-120. The shaft now rotates with a constant angular speed of $n=1450\text{rpm}$ in a bearing with variable dimeter. The clearance between shaft and hearing, which varies from $h_1=1.2\text{mm}$ to $h_2=0.4\text{mm,}$ is filled with a Newtonian lubricant whose dynamic viscosity is $0.1\text{Pa}\cdot \text{s}\text{.}$ Determine the torque required to maintain the motion.