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Two solid steel shafts $(G=77\mathrm{.}2$GPa $)$ are connected to a coupling disk $B$ and to fixed supports at A and $C.$ Take $T=1\mathrm{.}6$

$kN*m.$

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Determine the maximum shearing stress in shaft $BC.$

The maximum shearing stress in shaft $BC$ is