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## Homework Statement

Disk A, with a mass of 9.0 and a radius of 90 , rotates clockwise about a frictionless vertical axle at 30 . Disk B, also 9.0 but with a radius of 10 , rotates counterclockwise about that same axle, but at a greater height than disk A, at 30 . Disk B slides down the axle until it lands on top of disk A, after which they rotate together.

## Homework Equations

ive been trying to find the acceleration? a=delta w/delta t but obviously this isnt wokring!!!

## The Attempt at a Solution

I can't even attempt a solution. im completely lost on this one, so much so i registered for physics forum just to get some help.