1. The problem statement, all variables and given/known data A 240 g block on a 58.0 cm-long string swings in a circle on a horizontal, frictionless table at 85.0 rpm. A. What is the speed of the block? B. What is the tension in the string? 2. Relevant equations Look at the link in #3. 3. The attempt at a solution I'm not sure how to do this problem. Here is my work so far that shows what I've done: http://img200.imageshack.us/img200/9189/phys001.jpg [Broken] And it seems like no matter what I try to solve for, I need a theta to do anything. Is there a way to solve for theta that I'm not seeing? Or is there a way to solve the problem without needing theta?