3) A round steel bar having S = 800 MPa is subjected to loads producing maximum stresses in the critical cross-section of P/A = 70 MPa, Tc/J = 200 MPa, My/I = 300 MPa and VQ/It = 170 MPa. (a) Create a sketch of the circular cross-section and indicate the magnitude/ direction of the stresses at each of the critical locations, (b) Sketch Mohr circles showing the relative locations of maximum normal stress and maximum shear stress. (b) Determine the safety factor with respect to initial yielding according to the Maximum Shear Stress Theory and according to the Maximum Distortion Energy Theory.