Thursday

October 23, 2014

October 23, 2014

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 -

**Answer this Question**

**Related Questions**

physics - A uniform thin rod of length 0.55 m and mass 5.5 kg can rotate in a ...

Physics - A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate ...

physics - A thin non-uniform rod of length L=2.00 m and mass M=9.00 kg is free ...

physics - Two 2.3 kg balls are attached to the ends of a thin rod of negligible ...

Physics - A thin uniform rod (length = 1.3 m, mass = 3.2 kg) is pivoted about a ...

Physics (please help!!!!) - A thin uniform rod (length = 1.3 m, mass = 4.1 kg) ...

Physics - A thin rod of length L and mass M rotates about a vertical axis ...

Physics - A uniform rod of mass M and length d is initially at rest on a ...

physics - A bullet with mass m and a velocity of v is shot perpendicular to the ...

College Physics - A uniform horizontal rod of mass M and length l rotates with ...