1. The problem statement, all variables and given/known data A mass m on a frictionless table is attached to a hanging mass M by a cord through a hole in the table; the hole has no frictional effect on the string. Find the condition (the speed of the mass and the radius of its circular motion) with which it must spin for M to remain at rest 2. Relevant equations f=ma a_c=v^2/r 3. The attempt at a solution is the answer v=sqrt(Mgr/m)? i feel like you need to seperate r and v but I cant find a way to express both variable individually with the givens.... i think speed and radius depend on each other so there can be multiple answers. is this correct? how I solved it: system m x components: Ftension = ma Ftension = mv^2/r system M Fgravity - F tension (cordinate system with y axis going downard) = ma a is 0 so Fgravity = Ftension TENSION FORCES NEED TO BE SAME FOR BOTH SYSTEMS so Fgravity can be rewritted as Mg so Mg = mv^2/r and thus v = sqrt(Mgr/m) right?