- #1

rasgar

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1. Homework Statement

A wooden block of mass M resting on a frictionless, horizontal surface is attached to a rigid rod of length L and of negligible mass. The rod is pivoted at the other end. A bullet of mass m traveling parallel to the horizontal surface and perpendicular to the rod with speed v hits the block and becomes embedded in it.

What is the angular momentum of the bullet- block system? (For the following answers, use M for the mass M, m for the mass m, and L for the length .)

2. Homework Equations

L=Iw=rP

3. The Attempt at a Solution

Well I easily got the solution with the known v (m*v*l), but the question asks for the solution with respect to only the mass of the bullet and the block, and the length of the rod. Since angular momentum has time as a part of its unit, I don't see how I'm supposed to do it. I thought I could find the torque and take the integral with respect to time, but the force of the system isn't known, so I'm completely lost. I think the physics teacher solved this, but I missed class, and there's a test in two days (I can't make it to his office hours either).

A wooden block of mass M resting on a frictionless, horizontal surface is attached to a rigid rod of length L and of negligible mass. The rod is pivoted at the other end. A bullet of mass m traveling parallel to the horizontal surface and perpendicular to the rod with speed v hits the block and becomes embedded in it.

What is the angular momentum of the bullet- block system? (For the following answers, use M for the mass M, m for the mass m, and L for the length .)

2. Homework Equations

L=Iw=rP

3. The Attempt at a Solution

Well I easily got the solution with the known v (m*v*l), but the question asks for the solution with respect to only the mass of the bullet and the block, and the length of the rod. Since angular momentum has time as a part of its unit, I don't see how I'm supposed to do it. I thought I could find the torque and take the integral with respect to time, but the force of the system isn't known, so I'm completely lost. I think the physics teacher solved this, but I missed class, and there's a test in two days (I can't make it to his office hours either).