The 8-lb slotted circular disk has a radius of gyration about its center O of 6 in. and...

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 N₁ = 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 N₂ 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?