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March 29, 2015

March 29, 2015

Posted by **Darlene** on Friday, February 8, 2008 at 6:10pm.

- AP Physics -
**drwls**, Friday, February 8, 2008 at 6:38pmUse the law of conservation of angular momentum, measured about the vertical axis. Initially, the rod has no angular momentum but the bullet has angular momentum m V (L/2) cos 60 about that axis. Afterwards, the rod with embedded bullet has moment of inertia I = (1/12)ML^2 + m (L/2)^2 and its moment of inertia is I w. This is enough information to solve for m, the initial velocity V of the bullet.

M = rod mass = 3.5 kg

m = bullet mass = .003 kg

L = rod length = 0.3 m

w = final angular velocity of rod = 9 rad/s

- AP Physics -
**Darlene**, Friday, February 8, 2008 at 6:58pmI had been using that equation but stupid me was trying to solve for w instead of v! But is it definitely cosine? I had been thinking it would use sine. Thank you sooo much!

- AP Physics -

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