1. The problem statement, all variables and given/known data hi guys i need help solvign the following problem. A mass 1kg on a frictionless table is attached to a hanging mass 4kg by a cord through a hole in the table. Find the frequency with which 1KG mass must move for 4kg to stay at rest, if the radius of the circle is 75m. http://img32.imageshack.us/img32/9601/phyp.jpg [Broken] 2. Relevant equations m(v2/R v = 2piR/T T = 1/f ac = 4pi * R/ T2 3. The attempt at a solution Well i dont really know where to start as there is no angle given so i found the circumference first. which is 4.71 or 471 cm. I think that is useless because i dont know what to do with it. I know i need to find ac first before i can find the frequency right? So can someone give me a hit on the first step or where to start? thanks.