In $($Figure $1),$ the $2\mathrm{.}4$ in$.-$diameter, $L=4-$ft$.$ long rod is made from Steel A$36,$ and $F=90$kip,$M=16$kipft.Use a factor of safety of $2$ against yielding failure.

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Part B

Determine the in$-$plane principal stresses.

Express your answers in kilopounds per square inch to three significant figures separated by a comma.

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