question $2(0\mathrm{.}5$ points$)$

$213$ A cube of steel and $v=0\mathrm{.}30$ is loaded with a uniformly distributed pressure of $690$

MPa on the four faces having outward nornals in the $x$ and $y$ directions. Rigid conitraints limit

the total deformatisas of the cube in the z direction to $0\mathrm{.}05$ mm $.$ Determine the normal stress, if

any, which develops in the a direction. The length of a side of the cube is $95$ mm $.$

$251\mathrm{.}05$ MPa

$251\mathrm{.}05$ MPa

$25\mathrm{.}105$ MPa

$-25\mathrm{.}105$MPa