tetherball problem

1. The problem statement, all variables and given/known data

A .3 kg ball is attached to a string that is 50.0 cm in length, and completes 2 circles every second. Find the tension required to whirl the ball with the given constraints and also find the angle θ



2. The attempt at a solution

I only have that Ftcosθ = Mg and that mv^2/r = ftsinθ

I don't know where to go from there since all I have is the length and mass because to find the radius it is r=Lsinθ which I cannot find without θ...