The sign shown below is supported by a solid post of radius 60 mm, and is subjected to an orthogonal force exerted by the wind, P = 1200 N. Consider the cross-section at the bottom of the post, and a) determine the state of stress on the stress element A shown; b) find the principal stresses and show them on a properly oriented element. 3.0 m 1.2 m. Welcome to Salgary P Post Cross-section (top view) A X Stress element A (front view)