The system shown is initially at rest when the bent bar starts to rotate about the vertica...

The system shown is initially at rest when the bent bar starts to rotate about the vertical axis AB with constant angular acceleration α0 = 3 rad/s2. The coefficient of static friction between the collar of mass m = 2 kg and the bent bar is μs = 0.35, and the collar is initially d = 70 cm from the spin axis AB.

Determine the number of rotations undergone by the bent bar when the collar starts to slip relative to it.

Figure P3.65