For the 4-bar planar truss structure shown below: E.A 1 T EA ( E,2A L 3 E.A B 2 L 30 a) b) Hand calculate the global set of equations [K]{d}={P}. Solve for the displacements {d}, and then calculate the axial force in each member and the reaction forces at the supports. Use the following data: E=70 GPa, P 100 N, L=1 m, A=1 cm. = Write a MATLAB code to compute displacements and stresses if, in addition to force P, the system is subject to a temperature rise of 100 K. The coefficient of thermal expansion for the truss material is given as = 510-6 /K.