- #1

- 17

- 0

_{o}, but in opposite directions. The two disks are brought slowly together. The resulting frictional force between the surfaces eventually brings them to a common angular velocity.

(a) What is the magnitude of that final angular velocity in terms of ω

_{o}

[tex]\frac{3}{5}[/tex]ω

_{o}< - I know that's right.

(b) What is the change in rotational kinetic energy of the system? (Take K as the initial kinetic energy.) This is what I need help with.

I used Ke=Iω

^{2}, coupled the system, considered one direction negative and one positive, and got [tex]\frac{9}{50}[/tex]mr

^{2}ω

_{o}

^{2}, which is apparently wrong. . .

Thank you ahead of time!