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 = 0.6, the angle of the bend in the bar is θ = 30°, and the collar is initially at 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 P3.144
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