Question (2): An element in plane stress at the surface of a large machine is subjected to stresses x=15,000psi, y=5,000psi, and xy=4,000psi, as shown. Using Mohr's circle, determine the following quantities: (a) the stresses acting on an element inclined at an angle =40ccw, (b) the principal stresses, and (c) the maximum shear stresses