1. Use Mohr's circle to finish the following problems. For the given state of stress, determine: a) the orientation of the principal planes b) the principal stresses c) match each principal stress to one principal plane by drawing principal stresses on a material element orientated in principal directions d) the orientation of the planes that have maximum magnitude of shear stress e) the corresponding shear stress and normal stress on these planes in d) (with sign) f) draw the normal and shear stresses on a material element oriented in the direction specified in d). 50 MPa 12 ksi 10 MPa. 15 MPa b) 5 ksi 8 ksi