b) If due to the applied loading on the shaft the element at point A (see figure QA.2.1) is subjected to the state of stress shown in Figure QA2.2, 3.76 MPa 1.019 MPa Figure QA2.2 iv. Determine the average normal stress and the radius of the Mohr's circle V. Jan 2020 [4 Marks] Sketch the Mohr's circle, clearly highlight the coordinates of the centre and the reference point used. [6 Marks] Page 4 of 16 5104MECH Applied Mechanics 2 vi. Determine the principal stresses and highlight them on the Mohr's circle [4 Marks] vii. The shaft is made from a brittle material having an ultimate strength of Gult = 40MPa, determine if the shaft fails according to the maximum- normal-stress theory. [5 Marks]