Homework Help: Angular Momentum Equation

1. Nov 8, 2008

jessedevin

1. The problem statement, all variables and given/known data
A projectile of mass m moves to the right with a speed vi. The projectile strikes and sticks to the end of a stationary rod of mass M, of length d, that is pivoted about a frictionless axle through its center.

(a) Find the angular speed of the system right after the collision. (Use v_i for vi, m, M, and d as appropriate in your equation.)
(b) Determine the fractional loss in mechanical energy due to the collision. (Use v_i for vi, m, M, and d as appropriate in your equation.)

2. Relevant equations

If$$\omega$$f=Ii$$\omega$$i
W= K1-K2

3. The attempt at a solution
i did it like this but for some reason my part (b) is saying that I'm wrong. Can someone help?

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Last edited by a moderator: May 3, 2017
2. Nov 9, 2008