4. Consider the Euler-Bernoulli beam model. Derive the distribution of the verti- cal normal stress oy(x, y) in an arbitrary longitudinal position x and the cross section is uniform rectangular one. The load q(x) is acting on the top of the beam. Are the stress boundary conditions satisfied at the top and bottom of the beam? Draw the distribution of oy as a function of y coordinate. Hint. See the example 3.3 in the lecture notes. q(x) x