3) Determine the principal stresses and principal directions for the stress tensor in problem 2. = 2) A state of stress at a point in a body is defined by the stress compo- nents 11 1000, 22 = -1000, 12 = 500,023 -200 and 13 = 033 = 0. Consider a plane that passes through the point and has unit normal vector (1/10,3/10,3/10) relative to the Cartesian axes X1, X2,X3