Problem $2.$ The solid circular shaft $AB$ in Figure $2$ has a diameter of $12$ mm $.$ The shaft is clamped in $B$ and

linked to a rigid plate $AC$ in $A.$ If the material of the shaft is brittle, with $S_{ut}$ of $10$ MPa and $S_{uc}$ of $-48$ MPa $,$

and we apply a force $F($as shown in Figure $2),$ compute $F$ that will cause failure using the Modified Mohr

criterion.