The state of stress of a plane stress element is as shown in Figure Q4(a), while Figure Q4(b) shows the principal stresses of the same element. By using Mohr Circle, determine; (a) the angle of orientation (6) of the principal stress element, (7 marks) (b) the normal stress oy and the shear stress ty of the element, (7marks) (c) the value of the shear stress on a pure shear element. Show the stress on a sketch of a properly oriented element. (6 marks) (20 marks) 35 MPa 10 MPa FIGURE Q4(a) FIGURE Q4(b) 50 MPa