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1. Sketch the elongation-force and stress-strain graphs for a) a copper wire, b) fibre glass and c) a rubber band. up to their breaking point

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1. Sketch the elongation-force and stress-strain graphs for a) a copper wire, b) fibre glass and c) a rubber band. up to their breaking point [5 marks] d) Explain the differences between the shapes of the graphs for these three materials in terms of their molecular structure. [15 marks]

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