申論題

3. [15 points] The beam AB has a negligible mass and thickness and is subjected to a triangular distributed loading. It is supported at one end by a pin and at the other end by a post having a mass of 50 kg and negligible thickness. Determine the two cocficients of static friction at B and at C so that when the magnitude of the applied force is increased to P = 150 N the post slips at both B and C simultaneously.