A rod is made from two segments: $AB$ is steel and $BC$ is brass. It is fixed at its ends and subjected to a torque of $T=680N*m.$

$G_{st}=75$GPa,$G_{br}=39$GPa. $($Figure $1)$

Figure

Part A

If the steel portion has a diameter of $30mm,$ determine the required diameter of the brass portion so the reactions at the walls

will be the same.

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

$d=$

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