Read the examples: 6,7, and 8 and finish. For the given state of stress, determine: a) the orientation of the principal planes, b) the principal stresses. c) match two principal stresses to two principal directions by drawing a material element orientated in principal directions and indicating the principal stresses. d) the orientation of the planes that have maximum magnitude of shear stress. e) the corresponding shear stress and normal stress on these planes. f) draw the normal and shear stresses on a material element oriented in the direction specified in d), indicating the normal and shear stresses (with direction) on the two sides of the element 6) 7) 50 MPa 40 MPa 10 MPa 4 10 MP 15 MPa + 35 MPa 60 MPa 8) 12 ksi 5 ksi 8 ksi