Beam AB has a negligible mass and thickness, and supports the 200-kg uniform block. It is...

Beam AB has a negligible mass and thickness, and supports the 200-kg uniform block. It is pinned at A and rests on the top of a post, having a mass of 20 kg and negligible thickness. Determinc the minimum force P needed to move the post. The coefficients of static friction at B and C are µB = 0.4 and µC = 0.2, respectively.