$ \quad$ A solid circular shaft, made of ductile material with yield stress $\sigma_{Y}=280 \mathrm{MPa}$, is subjected to a torque of $10 \mathrm{kNm}$. Using the Tresca failure theory, the smallest radius of the shaft to avoid failure is _________$\mathrm{cm}$ (round off to two decimal places).

$ \quad$ A solid circular shaft, made of ductile material with yield stress $\sigma_{Y}=280 \mathrm{MPa}$, is subjected to a torque of $10 \mathrm{kNm}$. Using the Tresca failure theory, the smallest radius of the shaft to avoid failure is _________$\mathrm{cm}$ (round off to two decimal places).

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