$2\mathrm{.}97$ Knowing that, for the plate shown, the allowable stress is $120$ MPa $,$ determine the maximum allowable value of

the centric axial load $P.$

PROBLEM $2\mathrm{.}85*$

Determine the dilatation $e$ and the change in volume of the $8-in.$ length

of the rod shown if $($a$)$ the rod is made of steel with $E=29{10}^6$

and $v=0\mathrm{.}30,(b)$ the rod is made of aluminum with $E=10\mathrm{.}6{10}^6$

and $v=0\mathrm{.}35.$

PROBLEM $2\mathrm{.}85*$

Determine the dilatation $e$ and the change in volume of the $8-in.$ length

of the rod shown if $($a$)$ the rod is made of steel with $E=29{10}^6$

and $v=0\mathrm{.}30,(b)$ the rod is made of aluminum with $E=10\mathrm{.}6{10}^6$

and $v=0\mathrm{.}35.$