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Figure show the stress-strain curve for ...

Figure show the stress-strain curve for a given material. What are (a) Young's modulus and (b) approximate yield strength of the material?

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a)From the graph, corresponding to point P,
Stress = `150 xx 10^(6) N//m^(2), ` Strain = `0.002 = 2 xx 10^(-3)`
Young.s modulus,
`Y = ("stress")/("strain")= (150 xx 10^(6))/(2 xx 10^(-3))=7.5 xx 10^(10) N//m^(2)`
b) From graph, corresponding to point B (yield point), stress = `300 xx 10^(6) N//m^(2)`. Thus, approximate yield strength = `2 xx 10^(8) N//m^(2)`.
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