1. a. Assemble the stiffness matrix for the assemblage shown in Figure P3–19 by superimposing the...

1. a. Assemble the stiffness matrix for the assemblage shown
in Figure P3–19 by superimposing the stiffness matrices of the springs. Here k
is the stiffness of each spring.

b. Find the x and y components of deflection of node 1.

2. For the plane truss structure shown in Figure P3–20,
determine the displacement of node 2 using the stiffness method. Also determine
the stress in element 1. Let A = 5 in^{2}, E = 1 106 psi, and L = 100
in.