4. Stress from Bi-axial Load. A block being compressed, while also being pulled in tension, creates the following stress components on the vertical and horizontal surfaces of the stress element (dashed white box). We are interested in calculating the stress components on the following two surfaces marked with a thick black line. 5kPa 60 deg 10kPa+ a. Using a force balance approach, calculate the resultant traction, and the shear and normal stress components that exist on the above surfaces. Draw these vectors in the images below. [value = 2] b. On the graph below, plot and label the stress components on the surfaces from part (b) and from the surfaces normal to the x- and y-axis. Connect the points to create Mohr's circle (use a compass). From this plot, estimate the magnitude of the principal stresses and max shear stress. [ value = 1] 4 shear Onormal c. Compare your results from part (a) with calculations using the transformation equations given in the book (3-8, 3-9). Remember that the sign from the transformation equation relates to the x-y coordinate system for that specific stress element, [value = 0.5] d. Compare your principal stress and max shear stress results (magnitude) from part (b) with calculations using the transformation equations given in the book (3-13, 3-14). [value - 0.5]