A hollow circular shaft has an outer diameter of \(100\,\mathrm{mm}\) and a wall thickness of \(25\,\mathrm{mm}\). Allowable shear stress in the shaft is \(125\,\mathrm{MPa}\). The maximum torque the shaft can transmit is
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For a hollow circular shaft,
\[
\boxed{
T=
\frac{\pi}{16}\tau
\frac{D^4-d^4}{D}.
}
\]