The part shown is loaded at point C with 300 N in the positive x direction and at point E with 200 N in the positive y direction. The diameter of the bar ABD is 12 mm. Evaluate the likelihood of failure in section AB by providing the following information: 

(a) Determine the precise location of the critical stress element at the cross section at A (i.e., specify the radial distance and the angle from the vertical y axis

(b) Sketch the critical stress element and determine magnitudes and directions for
all stresses acting on it.

(c) Sketch the Mohr's circle for the critical stress element, approximately to scale.
Label the locations of all three principal stresses and the maximum shear stress.

(d) For the critical stress element, determine the three principal stresses and the
maximum shear stress.