$2.[30$ Pts$.]$ Plot on the log$-$log coordinate area below the estimated S$-$N curves for $($a$)$ bending, $($b$)$ axial, and $($c$)$ torsional loading of a $2-$inch diameter AISI $1050$ Normalized round steel bar $($Appendix C$-4$a$),$ for a commercially polished surface. For each of the three types of loading, what is the fatigue strength corresponding to $(1)\backslash (10^\{6\}\backslash )$ or more cycles, $(2)\backslash (10^\{3\}\backslash )$ or more cycles, and $(3)\backslash (6\backslash$times $10^\{4\}\backslash )$ cycles?