Tension in rod when 2.0-kg ball swings through bottom of vertical circle

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Homework Statement


A 2.0-kg ball is attached to a light rod that is 1.2 m long. The other end of the rod is loosely pinned at a frictionless pivot. The rod is raised until it is inverted, with the ball above the pivot. The rod is released and the ball moves in a vertical circle. The tension in the rod as the ball moves through the bottom of the circle is closest to:


The Attempt at a Solution



This is one of my homework problems. I can't find an example even remotely close in my textbook. Could someone explain how to go about solving this type of problem please?
 
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Discussion

have you learned circular motion?

if yes, find the velocity of the ball at the mean position, then finding centripetal force you can solve the problem.
 
Im confused don't I need to know the radius to solve for the velocity?
 
you know the length of the rod, so that's good enough.
 
Im still drawing a black. A little assistance with the first step?
 
The normal acceleration to the curve is the tension in the rod.