The disk spins about the fixed axis BB, which is inclined at the angle to the

The disk spins about the fixed axis BB, which is inclined at the angle α to the vertical z-axis. A small block A is placed on the disk in its lowest position P at a distance r from the axis when the disk is at rest. The angular velocity ω = θ˙ is then increased very slowly, starting from zero. At what value of ω will the block slip, and at what value of ω will the slip first occur? Use the values α = 20°, r = 0.4 m, and μ_s = 0.60. What is the critical value of ω if α = 0?

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