Tensile stress given theta and force (I'm kinda desperate) 1. The problem statement, all variables and given/known data Aluminum wire is lightweight. You can hang a piece of it nearly horizontally with very little tension. After having done so, you then hang a HEAVY (25 kg) block from the wire. The wire sags to make an angle of 12 degrees with the horizontal. Determine the radius of the wire. 2. Relevant equations Stress / Strain = Modulus Stress = Force / area = 25*9.8 / (pi)r^2 Strain = Delta L/L = [(L/cos12) - L / L] ? Young's Modulus for aluminum = 70 x 10^9 3. The attempt at a solution (25)(9.8) / [(pi)(r^2)] = (0.022)(70*10^9) r = 2.25 * 10^-4 This is wrong, Please give me solid advice and not simple hints please. I'm really tired of this problem and I'd like to solve it with as little guesswork as possible. I need to have a solution in a few answers. If you can help me I will love you till the ends of the earth.