A steel beam is installed in a building when the ambient temperature is $-12$C$.$ If the

beam if fixed at it$$s ends $($prevented from expanding$/$contracting$),$ calculate the stress

that will develop in the beam if the ambient temperature rises to $+32$C$.$ State whether

the stress is tension or compression. Assume E $=200,000$ MPa and $\backslash$alpha L$=12$x$10-6$

$(/\backslash$deg C$).$

$(3\mathrm{.}5$ Marks$)$