Example #$2$

For a specific material, a stress of $5,000$ psi results in a strain of $0\mathrm{.}000167,$ and a stress of $20,000$ psi results in a strain of $0\mathrm{.}000667.$

Find the following:

A$.$ Find the modulus of elasticity.

B$.$ Find the stress that results in a strain of $0\mathrm{.}0002$

Example #$3$

A$.$ Calculate Modulus of Elasticity when stress $=25,000$ and strain $=0\mathrm{.}000867$

B$.$ What material is that?