###### Mechanical Properties of Solids – Solutions

**1) A steel wire of length 4.7 m and cross sectional area 3.0 x 10 ^{-5} m^{2} stretches by the same amount as a copper wire of length 3.5 m and cross sectional area of 4.0 x 10^{-5} m^{2} 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 Y_{c}.

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?**

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ShikshaHouse

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Class 11th Physics - 9 Mechanical Properties of Solids - NCERT Solutions

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