Question $7\mathrm{.}60$ Compute the elastic moduli for the following polymers, whose stressstrain behaviors can be observed in the "Tensile Tests" module of Virtual Materials Science and Engineering $($VMSE$)($which may be accessed through all digital versions of this text$)$:

$($a$)$ high$-$density polyethylene

$2610$ MPa

$4810$ MPa

$343$ MPa

$276$ MPa