$*14-8.$ Determine the stiffness matrix $K$ for the truss. Take $A=0\mathrm{.}0015m^2$ and $E=200$GPa for each member.

$14-9.$ Determine the force in member $6.$ Take $A=0\mathrm{.}0015m^2$ and $E=200$GPa for each member.

$14-10.$ Determine the force in member $1$ if this member was $10mm$ too long before it was fitted into the truss. For the solution remove the $10-kN$ load. Take $A=0\mathrm{.}0015m^2$ and $E=200$GPa for each member.

stifnness method