1. The problem statement, all variables and given/known data http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/fa07/fig19.gif [Broken] A dumbbell consists of a slender rod of negligible mass and length L = 1 m and small steel balls attached to each end with mass 1 kg and 2 kg, respectively. It is pivoted at its center about a horizontal frictionless axle and initially held in place horizontally. The dumbbell is then released. What is the angular velocity of the system when the rod is vertical? 2. Relevant equations 3. The attempt at a solution I have figured out the angular acceleration upon release is 6.5rad/s^2 and the angular acceleration is zero at vertical (because of torque = 0 at vertical) But from there, i got stuck and i don't know how to link this acceleration into the velocity.. Please could someone help me out here?