Please answer all thtee questions but only in regards at $8\mathrm{.}7.8\mathrm{.}7$ Three R$.$ R$.$ Moore test specimens are made of steels having ultimate tensile strengths of $95,185,$ and $240$ ksi $.$ Estimate the ${10}^3-$cycle fatigue strength for rotating bending and also the bending endurance limit for each steel.

$8\mathrm{.}13$ How would the answers to Problems $8\mathrm{.}7$ and $8\mathrm{.}8$ change if the loading is reversed bending rather than rotating bending?

$8\mathrm{.}17$ Repeat Problem $8\mathrm{.}7$ for reversed torsional loading.