A load $P=30lb$ is applied to the

triangular truss shown in the figure. The

truss is supported at point A with a pin

support and at point $B$ with a roller

support. Find the internal forces in

member $AC$ and member $BC.$

Hint:

Determine the reaction forces at

points A and $B.$

Use equilibrium of a particle at each

joint $,$ and $C)$ as needed

Remember that internal forces can

only be along the long axis of the

members