text: vector math? what is the tension in the rope holding up the sign, if this can be found by analyzing the forces acting on the bar. the rope pulls the bar up and to the left; the weight of the sign pulls it strait down; the elastic recoil of the wall pushes it to the right. if the weight of the bar itself is too small to worry about, the solution to the problem is? without a diagram and/or numbers indicating angles and weights, it's not really possible to answer your question.