Angular momentum with a large wooden turntable

[MITPhysics]

Homework Statement

Homework Equations

Li = Lf
L = I*omega
K = (1/2)*(I)*(omega)^2

The Attempt at a Solution

[/B]
Given that there are no non-conservative forces in action, I am assuming that the two kinetic energies should be equal. However, as shown by my work above, the two values are different, and I do not know where I went wrong.

 

[Orodruin]

Given that there are no non-conservative forces in action, I am assuming that the two kinetic energies should be equal.

This is not correct. Compare with the case of a clump of clay with some velovity hitting another stationaty piece of clay and sticking together. Is the kinetic energy the same before and after?

 

[Dr Dr news]

How would you describe the collision between the parachutist and the rotating disk?