1. The problem statement, all variables and given/known data A physicist is standing 10 feet from the center of a platform that can rotate about a vertical axis - the platform is horizontal. She is holding a weight that is hanging freely from a string. The platform starts rotating and eventually she notices that the weight is no longer hanging straight down but is making an angle of 10° with the vertical. How fast is she moving at that time? 2. Relevant equations Normally, for centripetal equations I would use a=v2/R I've also used the equation Fcentripetal=4∏2Mf2R 3. The attempt at a solution I've never had to solve a centripetal force equation with knowing the mass of either the person or the weight or without a velocity. I'm honestly not quite sure what route to go to solve this problem.