Finding angular velocity of a rotating bar using sum of moments - Method 3

The video tutorial demonstrates how to calculate the angular velocity of a bar released from rest when it reaches a vertical position. The problem is solved using three different methods: energy methods with pure rotation, energy methods with rotation and translation, and Newton's laws. Viewers are encouraged to try solving the problem themselves before choosing a preferred method.

What are the two equations mentioned that can be used in the third method?

What recommendation is given before clicking on the corresponding link for solving the problem?