Mechanical Properties of solids NCERT Solutions Class 11 Physics - Solved Exercise Question 9.2

Question 9.2:
Figure 9.11 shows the strain-stress curve for a given material. What are (a) Young’s modulus and (b) approximate yield strength for this material?
(a) It is clear from the given graph that for stress 150 × 106 N/m2, strain is 0.002.
∴Young’s modulus, Y = Stress / Strain
= 150 X 106 / 0.002  =  7.5 X 1010 Nm-2
Hence, Young’s modulus for the given material is 7.5 ×1010 N/m2.

(b) The yield strength of a material is the maximum stress that the material can sustain without crossing the elastic limit.
It is clear from the given graph that the approximate yield strength of this material is 300 × 106 Nm/2 or 3 × 108 N/m2.

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