Meriam, Kraige & Bolton — Plane Kinetics of Rigid Bodies: Problem 6_163

6/163 The 8-lb slotted circular disk has a radius of gyration about its center \(O\) of 6 in. and initially is rotating freely about a fixed vertical axis through \(O\) with a speed \(N_1 = 600\) rev/min. The 2-lb uniform slender bar \(A\) is initially at rest relative to the disk in the centered slot position as shown. A slight disturbance causes the bar to slide to the end of the slot, where it comes to rest relative to the disk. Calculate the new angular speed \(N_2\) of the disk, assuming the absence of friction in the shaft bearing at \(O\). Does the presence of any friction in the slot affect the final result?