Y L 4 3 E, A E, 272 A L 45 45 2 2 DI E, A X Figure 3: Problem 4. Question 1. Question points 20. Perform analytical calculations to: 1. Determine the global stiffness matrix (provide symbolic results) 2. Determine the nodal displacements (provide symbolic results) 3. Determine the reaction forces (provide symbolic results) 4. Determine the stresses in each bar of the assembly (provide symbolic results) 5. Use the following numerical values to answer the previous items: L = 150 mm, E = 2.0 x 104 Nmm-2, A = 250 mm and P = 6.0 x 104 N (and v = 0.3 for ANSYS )