4. A 6-kg disk (kg 0.6 m) has a rope wrapped around its inner hub. If a 30 N force is applied to the rope as shown, determine: (a) Angular acceleration of the disk (b) Acceleration (ac) of the disk (c) Frictional force between the disk and the surface r=1m 6 kg- P = 30 N 12=.2 m -0.15 KG = .6m