$(11$ points$)($a$)$ Using Figure $9\mathrm{.}39$ at a temperature of $925\backslash$deg C$,$ compute the stress that produces

a rupture lifetime of $0\mathrm{.}1$ h for an S$-590$ alloy.

$(11$ points$)($b$)$ Compare this value with the stress level determined from the Larson$-$Miller plot

of Figure $9\mathrm{.}41($also for this S$-590$ alloy$)$ using the same temperature $(925\backslash$deg C$)$ and rupture

lifetime $(0\mathrm{.}1$h$).$