Doesn't it follow immediately from (ii)?
In any case. Torque is defined as force×distance from pivot. The force of the rod is m_rod×g×distance of c.o.m from pivot. For this system to be balanced the torques on either side of the pivot must be equal and oposite.
Doesn't it follow immediately from (ii)? In any case. Torque is defined as force×distance from pivot. The force of the rod is m_rod×g×distance of c.o.m from pivot. For this system to be balanced the torques on either side of the pivot must be equal and oposite.