PROBLEM $5(7\mathrm{.}15)$

A single crystal of a metal that has the FCC crystal structure is oriented such that a tensile stress is applied parallel to the

$100$ direction. If the necessary to cause slip to occur on the $(111)$ plane in the $[1-10]$ direction.

Use Equation $7\mathrm{.}4$ in the textbook, namely

${}_{CRSS}={}_y$Cos$Cos$

Hence

${}_y=\frac{{}_{CRSS}}{\text{C}\text{o}\text{s}Cos}$

To calculate $,$ use the dot product between the lo