Let A1 = A2 = A3 = A, E1 = E2 = E 3 = E, and L1 = L2 = L3 = L. If nodes 1 and 4 are fixed and a force P acts at node 3 in the positive x direction, find expressions for the displacement of nodes 2 and 3 in terms of A, E, L, and P. Let A= 6 x 10-4 m2, E =70 GPa, L=0.25 m,and P=5000 N.

• Determine the numerical values of the displacements of nodes 2 and 3. • Determine the numerical values of the reactions at nodes 1 and 4.
• Determine the stresses in elements 1-3.