Segments $\backslash ($ A B $\backslash )$ and $\backslash ($ B C $\backslash )$ of the shaft have circular and square cross sections, respectively. The shaft is made from A$-36$ steel with an allowable shear stress of $\backslash (\backslash$tau$\_\{\backslash$text $\{$allow $\}\}=45\backslash$mathrm$\{$MPa$\}\backslash ),$ and an angle of twist at end $\backslash ($ A $\backslash )$ which is not allowed to exceed $0\mathrm{.}012$ rad $.$ The shaft is fixed at $\backslash ($ C $\backslash ).($Figure $1)$

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$1$ of $1$

Part A

Determine the maximum allowable torque $\backslash ($ T $\backslash )$ that can be applied at end $\backslash ($ A $\backslash ).$

Express your answer to three significant figures and include the appropriate units.

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