1. The problem statement, all variables and given/known data Find the centripetal force of an object that is being swung in a horizontal circle on a string above your head given the constant velocity of the object, the period, and the circumference of the circle. Hanging from the bottom of the string is another mass (50g). 2. Relevant equations Fc = (mv^2)/T Tension = Fg = mg 3. The attempt at a solution My difficulty is that you are not given the mass of the object in the circle, and therefore, I don't think I can use the mv^2/T formula to calculate the centripetal force of the object. I know that the tension in the string from the hanging mass in vertical equilibrium is providing the centripetal force from the hanging weight. Would that mean that Fc = mg, or can I still use mv^2/T because the know the mass of the object that is hanging?