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Problem $10\mathrm{.}062$ Centric loading of an aluminum $2014-$T$6$

Consider the aluminum alloy $2014-$T$6.$ Given: $t=20\mathrm{.}02mm.$

Problem $10\mathrm{.}062.$c Largest allowable length of a centrically loaded aluminum $2014-$T$6$ with a specific load

Determine the largest allowable length of the aluminum bar $AB$ for a centric load $P$ of magnitude $25$ kN $.$

The largest allowable length of the aluminum $\frac{?}{\text{b}\text{a}\text{r}}AB$ for a centric load $P$ of magnitude $25$ kN is mm $.$