A propeller shaft subjected to combined torsion and axial thrust is designed to resist a shear stress of 63 MPa and a compressive stress of 85 MPa (see figure). Consider only the in- plane stresses...

Extracted text: A propeller shaft subjected to combined torsion and axial thrust is designed to resist a shear stress of 63 MPa and a compressive stress of 85 MPa (see figure). Consider only the in- plane stresses (the stresses in the xy plane). 85 MPa 63 MPa Determine the principal stresses. Round your answers to one decimal place. Give your answers in descending order. ( a) σ1 MPa (b) 02 = MPa (c) Show the principal stresses on a sketch of a properly oriented element. Choose the correct sketch.