# Impossible angular acceleration problem

1. Oct 16, 2007

### royguitarboy

Impossible "angular acceleration" problem

1. The problem statement, all variables and given/known data

The figure below shows a hollow cylindrical tube of mass M = 1.2 kg, L = 1.9 m, and moment of inertia ML2/10. Inside the cylinder are two disks of mass m = 0.6 kg, separated by a distance l = 0.8 m, and tied to a central post by a thin string. The system can rotate about a vertical axis through the center of the cylinder. The system rotates at (omega) such that the tension in the string holding the disks is 108 N just before it breaks. When the disks reach the end of the cylinder, they stick. Assume that the inside walls of the cylinder are frictionless. Determine the initial and final angular velocities of the system.

2. Relevant equations

Lf=Li
L=(moment of inertia)(omega)

3. The attempt at a solution

I'm not sure how to set this up. Any hint or help on how to set it up would be greatly appreciated.

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