1. The problem statement, all variables and given/known data A hollow shaft has torque being applied on both sides. The angle of twist is 50 degrees, the diameter is 100 mm, the thickness t has 5 mm. We are given that the allowable stress is 120 MPa, and the allowable shear stress is 50 MPa. We are asked to solve for the maximum torque. I know I will have to calculate for the torque using two equations and I will have to compare the answers. I will find torque using the max stress and i will find torque using the maximum shear stress. At first: I used, Shear stress (max) = Tr/J J = TT/2 * (ro^4 - ri^4) I get the wrong answer.. I am wondering what the relation is with Torque and Angle of twist I know, theta = TL/JG . But I'm not given L, and not told what material I have, so G is unknown. Thank you for all the help!!