20 MPa 40 MPa Problem 1 For the given state of stress, determine (a) the orientation of the planes of maximum in-plane shearing stress, (b) the maximum in-plane shearing stress and the corresponding normal stress, (c) the normal and shearing stresses after the element shown has been rotated through (i) 10 clockwise, (ii) 25 counterclockwise. 60 MPa 12 ksi Problem 2 For the given state of stress, determine the normal and shearing stresses after the element shown has been rotated through (a) 20 clockwise, (b) 15 counterclockwise. + 6 ksi 8 ksi