The 50-kg uniform beam (slender rod) is lying on the floor when the man exerts a force o...

The 50-kg uniform beam (slender rod) is lying on the floor when the man exerts a force of F = 300 N on the rope, which passes over a small smooth peg at C. Determine the initial angular acceleration of the beam. Also find the horizontal and vertical reactions on the beam at A (considered to be a pin) at this instant.