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  1. B

    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...
  2. B

    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...