This question really confuses me, I have got answers before but they dont fit with the answer in the book and it's due tomorrow 1. The problem statement, all variables and given/known data A large helium balloon is attached to the ground by two fixing ropes. Each rope makes an angle of 50 degrees with the ground. There is a force F vertically upwards of 2.15x10^3 N. The total mass of the balloon and it's basket is 1.95x10^2 kg Find the tension in either rope 2. Relevant equations I'm not sure what equation to use, in my book theres only upthrust = weight + tension which doesn't work with angles, and the equilibirum equations are explained properly in my text book 3. The attempt at a solution upthrust = weight + tension tension = upthrust - weight =2.15x10^3 - 1911 =239 239/2 = 119.5 but the answer in the book says it should be 131 N Please help.