For the bar subjected to the linearly varying axial line load shown in Figure P10–7,
use the linear strain (three-noded element) with two elements in the model, to determine
the nodal displacements and nodal stresses. Compare your answer with that in
Figure 3–31 and Eqs. (3.11.6) and (3.11.7). Let A ¼ 2 in.2 and E ¼ 30  106 psi. Hint:
Use Eq. (10.5.22) for the element sti¤ness matrix.