1. The problem statement, all variables and given/known data Two masses M of the same amount are tied to two stings of length L and 2L. If both masses are swung in unison faster and faster, which string will break first? 2. Relevant equations The formula I've been using is Tension = mv^2/r. 3. The attempt at a solution My understanding is that when the string breaks, tension will be 0. If I plug that into the formula the radius/length of the string will not matter. What am I doing wrong here?