Given the stresses in psi: xx = 1,500 yy = 2,000 zz = 3,500 xy = 600

Given the stresses in psi: σxx = 1,500 σyy = −2,000 σzz = 3,500 τxy = 600 τyz = −300 τzx = −500 Where x = east, y = north, z = up, compression is positive, find: the secondary principal stresses in the zx-plane and sketch