Checkpoint 13.4.1

The diagram shows a stationary 5-kg uniform rod (AC), 1 m long, held against a wall by a rope (AE) and friction between the rod and the wall. To use a single equation to find the force exerted on the rod by the rope at which point should you place the reference point for computing torque?

 

Answer:

At C (to get rid of the torque done by the unknown force exerted by the wall on the rod)