Problem $7\mathrm{.}1$ The picture at right shows the tensile stress$-$strain diagram of a low$-$carbon steel specimen. Estimate$/$calculate the following quantities:

a$.$ Young's modulus E;

b$.$ yield stress ${}_y$;

c$.$ ultimate stress ${}_{\text{u}\text{l}\text{t}\text{;}}$

d$.$ ductility;

e$.$ modulus of resilience;

f$.$ modulus of toughness;

g$.$ If the initial gage length of the specimen is $3\mathrm{.}25$ in$,$ what would be its final length after unloading from $70$ksi $?$