# Recent content by BARBARlAN

3. ### Conservation of momentum and energy problem

The answer was #1, III and IV only.
4. ### Conservation of momentum and energy problem

Total gravitational potential energy is not conserved (because the piece of clay that was at top originally ends up at the bottom). So any answer with IV in it is wrong, I'm thinking. EDIT: woops, I thought it was vertical, not horizontal. OK, GPE should remain constant then. EDIT2...
5. ### Conservation of momentum and energy problem

Homework Statement A uniform rod has a mass 2m and a length l, and it can spin freely in a horizontal plane about a pivot point O at the center of the rod. A piece of clay with mass m and velocity v hits one end of the rod, and causes the rod-clay system to spin. After the collisions...
6. ### Angular Momentum problem

ok I got it right! Thank you all very much :)
7. ### Angular Momentum problem

ok i got part 1 right. any tips on how to do part 2?
8. ### Angular Momentum problem

1.2168 kg*m^2 at .78m, .125 kg*m^2 at .25m. How does this help though when I don't know the mass of the stool or the person?
9. ### Angular Momentum problem

Homework Statement A student sits on a rotating stool holding two 2 kg masses. When his arms are extended horizontally, the masses are 0.78 m from the axis of rotation, and he rotates with an angular velocity of 1.7 rad/sec. The student then pulls the weights horizontally to a shorter...