Rigid bar ABC is supported by member $(1),$ which has a cross$-$sectional area of $0\mathrm{.}7$ in$.{?}^2,$ an

elastic modulus of $E=10200$ksi, and a coefficient of thermal expansion of a $=12\mathrm{.}7\frac{{10}^{-6}}{}F$ :

Assume that $a=85in.,b=40in.,$ and $c=125in.$ After load $P$ is applied to the rigid bar and the

temperature rises $65F,$ a strain gage affixed to member $(1)$ measures a strain increase of

$2564.$ Determine the magnitude of applied load $P.$

Note: Assume the strain measuring system does not automatically compensate for

temperature changes.

Answer:

$P=$

kips