1. The problem statement, all variables and given/known data I drew up a little diagram to illustrate the problem. The goal of this lab report is to find the h value (in cm) for each of the possible masses at B. (one problem for 500g, one for 700g and one for 900g. The only thing that should change is the h value. The leftmost mass never changes) θ and a are unknown. The pulley on the left is considered to be frictionless and the cords masses are negligible. Point B is "tied" so the cord does not slide and thus BC is fixed at 60 cm. Length AB however is variable due to the pulley. 2. Relevant equations Sin(θ) = opposite/hypotenuses Cos(θ) = adjacent/hypotenuses Tan(θ) = opposite/adjacent 3. The attempt at a solution Here are the equations I've come up with thus far. Cos(a) = ABx/4.9N Sin(a) = ABy/4.9N ABx/Cos(a) = ABy/ Sin(a) cos(θ) = (105-d)/60 (d being the top side of the left-most triangle, separated at h) tan(a) = h/d h = sqrt( (60^2) - ((105-d)^2) ) I can also say that: BCx = ABx (as this is a static question. B is at rest, thus all resulting forces acting on it are equal to 0) BCy + ABy - W = 0 or alternatively BCy + ABy = W (where W is the current mass of the object at point B) I "know" the solution lies in the angles, but for the life of me I just can't fit my equations together in order to draw a definite conclusion. I'd love a push in the right direction if anyone can contribute something to this. I keep trying to break down the forces but without an angle it is difficult and I can't find the proper substitution. First time post here, I hope I did it right, thanks in advance for any help.