Mechanical Properties of Solids – Solutions
1) A steel wire of length 4.7 m and cross sectional area 3.0 x 10-5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross sectional area of 4.0 x 10-5 m2 under a given load. What is the ratio of the young’s modulus of steel to that of copper?
Let the Young’s modulus of the steel wire be Ys and that of copper be Yc.
Young’s modulus of a wire, Y = Fl/Ae
As F, e are same for both the wire
= x A/
Thus, the ration of the Young’s modulus of steel to that of copper is 1.79:1.
2) Figure 9.11 shows that strain curve for a given material. What are?