A tank hanging off a hook, what are the tension forces? 1. The problem statement, all variables and given/known data Determine the forces in cables AB, AC and AD needed to lift the tractor which has a mass of 8Mg. 2. Relevant equations 3. The attempt at a solution I found the unit vectors of the three rope forces using the ropes' position vectors. B = [-0.5241i -0.3276j -0.7861k] C = [-0.5241i 0.3276j -0.7861k] D = [0.31623i 0j -0.9487k] So F_B = -9.8bB, F_C = -9.8cC and F_D = -9.8dD where b, c, d = magnitudes of the forces Then I set up a system of equations to find b, c and d. I found: b = c = -1.691Mg d = -5.6218Mg |F_b| = |F_c| = 9.8*1.691E6 = 1.66E7 N |F_d| = 9.8*5.6218E6 = 5.51E7 N But I checked and they aren't the right answers. What did I do wrong?