A bearing uses SAE-30 oil with a viscosity of 0.1 N s /m 2 . The bearing

Question:

A bearing uses SAE-30 oil with a viscosity of 0.1 N^∙s/m². The bearing is 30 mm in diameter, and the gap between the shaft and the casing is 1 mm. The bearing has a length of 1 cm. The shaft turns at ω = 200 rad/s. Assuming that the flow between the shaft and the casing is a Couette flow, fi nd the torque required to turn the bearing.