1. The problem statement, all variables and given/known data This is a problem about angular momentum and torque from the physics textbook Don't Panic Volume I. Attached is a screenshot of the problem. 2. Relevant equations L = mr2ω 3. The attempt at a solution The angular momentum must be conserved to keep ω constant. Initial L = (m1 + m2)(B/4)2ω Final L= ω(m1(B/4 - [itex]\alpha[/itex]t2)2 + m2x) Therefore, x= [(m1 + m2)(B/4)2 - m1(B/4 - [itex]\alpha[/itex]t2)2]/m2 The second ant must move toward the center so that its distance from it is x. What do you guys think? This is the last problem so I thought it would not be this simple. Is there something missing or should I do something more? Thanks in advance!