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?
Solution:
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/
= x
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?
Reviewer
ShikshaHouse
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Reviewed Item
Class 11th Physics - 9 Mechanical Properties of Solids - NCERT Solutions
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