1. (Book Problem) A round steel bar having S = 800 MPa is subjected to loads producing y calculated stresses o Axial = 70 MPa, τ = 200 MPa, σ, = 300 MPa and Torsion Bending τ = 170 MPa. ט a. Sketch Mohr's circle showing the relative locations of maximum normal stresses and maximum shear stresses. b. Determine the safety factor with respect to the initial yielding according to the max shear stress theory and to the distortion energy theory.