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Question 4 (25 marks) (a) The state of stress at a point is shown on the element in Figure Q4 Construct Mohr's circle. clearly indicating all important features, and use it to determine: The principal stresses (5 marks) # The orientation of the principal planes (5 marks) m. The maximum in-plane shear stress and average normal stress at the point (4 marks) tv. The orientation of the planes on which the maximum in-plane shear stresses act (4 marks) (b) Using the Mohr's circle constructed in part (a), determine and sketch the equivalent state of stress if an element is oriented 30° clockwise from the element shown (7 marks) S5 MPa 25 MPa 20 MPa Figure Q4 PTO 6