The uniform 640-mm rod has a mass of 3 kg and is welded centrally to the uniform 160-mm-radius circular disk which has a mass of 8 kg. The unit is given a spin velocity p = 60 rad/s in the direction shown. The axis of the rod is seen to wobble through a total angle of 30°. Calculate the angular velocity ψ˙ of precession and determine whether it is ψ˙₁ or ψ˙ ₂.

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320 or mm 30° 160 mm or 320 mm