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A material has Young's modulus Y = 6.6 x 10¹⁰ N/m² and bulk modulus K = 11 x 10¹⁰ N/m². Its Poisson's ratio is:

1. 0.8
2. 0.35
3. 0.7
4. 0.4

Correct answer: 0.4

Solution

6.6e10 = 3*(11e10)*(1 - 2sigma) => 0.2 = 1 - 2sigma => sigma = 0.4.

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