Question: Beam AB is subject to a uniform load of 300N/m and is supported at B by column BC. If the static coefficients of friction at B and C are (muB) = .2 and (muc) = .5, determine the force P needed to pull the column BC out from under the beam if P is .25m away from C and .75m away from B. Also the columb BC is 4 meters away from A. Neglect the weight of the members. I have a picture attached so you can get a better idea of the problem. I started off by finding the Normal force pushing down on the beam which is (300N/m)x(4m) = 1200N. Form there I am stuck as I don't know how to set up the problem to solve for the force P. I tried to find the sums of the horizontal and vertical forces but that wasn't quite working out as I couldn't figure out how to incorporate the moment of the force P. If I could just get a hint towards the right direction I would appreciate that a lot. Thanks in advance.