\[\left[ {\begin{array}{*{20}{c}}
{21}&0&0 \\
0&9&0 \\
0&0&6
\end{array}} \right]MPa\]
The maximum shear stress available for the above stress tensor is . . . . . . . . MPa.
A. 9
B. 6
C. 1.5
D. 7.5
Answer: Option A
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