Problem $4(20$ points$)$

We are given the statically indeterminate TRUSS shown in Figure $2,$ which we want to solve using the force method. We are also given that $EA={10}^6$kip for all members.

a$)$ Determine the support reactions of the structure. $(10$ points$)$

b$)$ Determine the axial force diagram, $[$N$],$ of the structure. $(10$ points$)$

Note: You may want to see if you can take advantage of your results from Problem $4$ of Homework $6.$

$2$