In the below problem the weight of the rod acts at it's centre (the centre of mass). But how do I know from the buoyant force acts? How do I proceed with the rest of the problem?
Here's my attempt to answer it:
Since I can assume that the rod is hinged about the point where it is bound with the string... The net external torques about the hinge point should be equal to zero.
However, for me to do that I need to know the distance from the hinge point to where the buoyant force is acting on which I am stuck.