a$)0\mathrm{.}628$ m

b$)2571\mathrm{.}6m{m}^3$

$2\mathrm{.}45.$ An aluminum alloy plate $(E=70$GPa,$v=\frac{1}{3})$ of dimensions $a=300mm,b=$

$400$ mm $,$ and thickness $t=10mm$ is subjected to biaxial stresses as shown in Fig.

P$2\mathrm{.}45.$ Calculate the change in $($a$)$ the length $AB,($b$)$ the volume of the plate.

Figure P$2\mathrm{.}45.$

Problem $13\mathrm{.}25$ The state of stress at a point $p$ in a material with modulus of

elasticity $E=28$GPa and Poisson's ratio $v=0\mathrm{.}3$ is

$\left[\begin{array}{ccc}250& -20& 0\\ -20& 250& 40\\ 0& 40& 200\end{array}\right]$MPa

What is the state of strain at $p?$

i wanI want detailed solution for both questions

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