Problem 9.22 The external and internal diameters of a collar bearing are 200 mm and 150 mm respectively. Between the collar surface and the bearing, an oil film of thickness 0.25 mm and of viscosity 0.9 poise, is maintained. Find the torque and the power lost in overcoming the viscous resistance of the oil when the shaft is running at 250 r.p.m.

3. If the coefficient of static friction at contact points A and B is μs = 0.3, determine the maximum force P that can be applied without causing the 100-kg spool to move. : P 343 N ↑ Engineering Mechanics 51 52 0.6 m 0.9 m Lecturer Dr.Isrra Hasan Nayel

Compression spring.