Problem $1[30\%]$

Determine the force in each member of the truss shown. State whether each member is in tension or compression. Given, $a=5m.$

Problem $2[30\%]$

Determine the force in member CD$,$ and CE of the truss shown. State whether it is in tension or compression.

Problem $3[30\%]$

The coefficients of friction are ${}_s=0\mathrm{.}40$ and ${}_k=0\mathrm{.}30$ between all surfaces of contact. Determine th smallest force $P$ required to start the $30-kg$ block moving if cable $AB$ is attached as shown.