Disk A, with a mass of 4.0kg and a radius of 70cm , rotates clockwise about a fr

Question

Disk A, with a mass of 4.0kg and a radius of 70cm , rotates clockwise about a frictionless vertical axle at 50rev/s . Disk B, also 4.0kg but with a radius of 60cm, rotates counterclockwise about that same axle, but at a greater height than disk A, at 50 rev/s . Disk B slides down the axle until it lands on top of disk A, after which they rotate together. After the collision, what is their common angular speed (in rev/s)? Express your answer using two significant figures. And in which direction do they rotate? clockwise counterclockwise

Explanation / Answer

w = 7.647 rev /s clockwise

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