Explain how to solve

$*3-28.$ Determine the force in members $GF,GC,HC,$ and $BC$ of the truss. State if the members are in tension or compression. Assume all members are pin connected.

Probs. $3-27/28$

Q$3.$ Q$3.$ When Carbon burns in air it forms Carbon dioxide. What volume of this gas is produced when $6g$ of Carbon burns? $(C=12,O=16)($All volumes are measured at $33C$ temp and $1\mathrm{.}18$atm pressure$).[2$ marks$]$

AT STP$,12gm$ carbon produce $22\mathrm{.}4L$ gas

$$ carbon produce $11\mathrm{.}2L$ gas