A uniform beam is modeled by Q4 elements, as shown. Qualitatively, and without calculation, plot o, and along the top edge from A to C, as predicted by the ele- ments. Also plot the exact stresses according to beam theory. Consider each of the following loadings. (a) F = 0, F = F3. F=-F3. (b) F = 0, (c) F>0, F=F3 = 0. (d) Repeat parts (a), (b), and (c) with Q6 elements. 2c A Problem 3.8 7K 7 X B C F1 F3 F2