$9\mathrm{.}38$ For a cylindrical S$-590$ alloy specimen $($Fig$-$ure $9\mathrm{.}40)$ originally $14\mathrm{.}5$ mm $(0\mathrm{.}57$ in$.)$ in diameter and $400$ mm $(15\mathrm{.}7$ in$.)$ long, what tensile load is necessary to produce a total elongation of $52\mathrm{.}7$ mm $(2\mathrm{.}07$ in$.)$ after $1150$ h at $650\backslash$deg C $(1200\backslash$deg F$)?$Assume that the sum of instantaneous and primary creep elongations is $4\mathrm{.}3$ mm $(0\mathrm{.}17$ in$.).$