3. The figure below shows a force extension-graph for a metal specimen. Force/N 4 m Proportional limit 250 Fracture 200 150 100 50 0.1 0.2 0.3 0,4 0.5 0.6 Extension/10-3m Calculate: a. The force constant of the specimen. b. The work done in stretching the specimen up to the proportionality limit.
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