The ball has a weight of 15 lb and is fixed to a rod having a negligible mass. If it is released from rest when theta = 0 deg., determine the angle theta at which the compressive force in the rod becomes zero (see attachment for an illustration)

answer should be 48.2 deg. Not sure how to get there though.

*Please see attachment for diagram.
Question:
The ball has a weight of 15 lb and is fixed to a rod having a negligible mass. If it is released from rest when theta = 0 deg., determine the angle theta at which the compressiveforce in the rod becomes zero.

I'm a new student to engineering and having some trouble with the question below.
how is the force in this problem moved through the system?
Direct shear stress = g = applied force/shear area

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