1. The homogeneous square body is positioned as shown. If the coefficient of static friction at B is 0.40, determine the critical value of the angle theta below which slipping will occur. Neglect friction at A. The image: 2. NA is the Normal force at A, which is perpindicular to the 60° incline. NB is the Normal force at B, which is in the positive y direction. W=mg which is the weight in the negative y direction. ƩFx=0 ƩFy=0 ƩMB=0 (the moment about B eliminates the unknowns NB and Ff. 3. I have three pages of handwritten work. I started with the Moment about B, and took the moment arm from B to the center of mass (s/2)((sin∅-cos∅)i + (sin∅+cos∅)j. W is simply -Wj. I took the moment arm for the NA force to be s(-cos∅i + sin∅j). NA=NA(cos(30)i + sin(30)j). Putting all of those together into the ƩMB= r1 x W + r2 x NA = 0. I took the cross products and then summed the y forces and x forces. I have not been able to find equations to set equal to each other or substitue into each other to end up with an answer of (some tangent function of ∅) = (some number) The answer to the problem is 20.7, but I have had no luck getting there. Thanks for the help ahead of time.