As shown in Tables A.3 and A.4, aluminum, concrete, copper, steel, and wood (Douglas fir...

As shown in Tables A.3 and A.4, aluminum, concrete, copper, steel, and wood (Douglas fir) have unique moduli of elasticity. (a) Plot the slope of the modulus of elasticity for each material on a single stress-strain diagram (similar to that shown in Figure 10.7). (b) Identify the stiffest material of those examined.