1. The problem statement, all variables and given/known data The cable AB keeps the 8-kg collar A in place on the smooth bar CD. The y axis points upward. Determine the distance s from C to the collar A for which the tension in the cable is 150N. location of: B: (0m, 0.5m, 0.15m) C: (0.4m, 0.3m, 0m) D: (0.2m, 0m, 0.25m) collar A's location is unknown. The required is the distance between C and collar A. The answer is 0.305m, but I need the solution for it. For an easier look, http://img86.imageshack.us/img86/4710/392ij8.jpg" [Broken] Someone answered this in yahoo answers. Can someone verify it? http://answers.yahoo.com/question/index;_ylt=AgV3Ti6P9WnWMOA1BU8rsIDzy6IX?qid=20061225063557AANnWr1" 2. Relevant equations e dc= dc/|dc| W=mg edc=eac s=distance between A and C 3. The attempt at a solution DC=0.2i+0.3j-0.25k e dc=0.4558i-0.6838j+0.5698k I'm not sure about this part... eab= -Axi+(0.5-Ay)j+(0.15-Az)k sqrt(Ax^2+Ay^2+Az^2-Ay-0.3Az+0.2725) eac= (0.4-Ax)i+(0.3-Ay)j-Azk sqrt(Ax^2+Ay^2+Az^2-0.8Ax-0.6Ay+0.25) sedci=-150eabi sedcj=-150eabj sedck=-150eabk eabi=-Axi/|AB| eabj=(0.5-Ay)j/|AB| eabk=(0.15-Az)k/|AB| I equated the "s" in the previous part and got... Ay=0.5-1.5Ax Az=1.25Ax+0.15 After that, my solutions just go in circles. I couldn't get what Ax is. Also, Is my use of Ax, Ay, Az correct? I'm doubting about it.