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When a rubber cord is stretched its change in volume is negligible compared with the change in its length. What is the Poisson's ratio of rubber?

1. infinite
2. zero
3. 0.5
4. -1

Correct answer: 0.5

Solution

If volume is conserved during stretching, 1 - 2*sigma = 0, so Poisson's ratio sigma = 0.5.

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