A small object of mass m, tied to a string of negligible mass, moves in uniform circular motion of radius r0 on a frictionless table. the string passes throug

A small object of mass m, tied to a string of negligible mass, moves in uniform circular motion of radius r0 on a frictionless table. The string passes through a hole in the table and an object of mass M hangs from it. For what value of ω will mass M just start to rise?