Solved: Disk A, with a mass of 2.0 kg and a radius of 40 cm, rotatesclockwise about a
Chapter 9, Problem 78(choose chapter or problem)
Disk A, with a mass of 2.0 kg and a radius of 40 cm, rotatesclockwise about a frictionless ve1tical axle at 30 rev/s. Disk B, also2.0 kg but with a radius of 20 cm, rotates counterclockwise aboutthat same axle, but at a greater height than disk A, at 30 rev/s. DiskB slides down the axle until it lands on top of disk A, atier whichthey rotate together. After the collision, what is their commonangular speed (in rev/s) and in which direction do they rotate?
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