1. The problem statement, all variables and given/known data A mass of 2.0 x 10^2 g is tied to a 1.6 m long string and spun in a vertical circle. What is the minimum frequency to keep the mass moving? 2. Relevant equations Fc=m4(pie)rf^2 3. The attempt at a solution I know I have to use this equation and make it equal to another to find Fc however I don't know which other equation.