Answer to Question 4

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A = 7.85 10-7 m2 ; l = 2.5 m; F = 500 N; Dl = 8.0 10-3 m

Formula:

Strain energy per unit volume = 0.5 500 N 8.0 10-3 m (7.85 10-7 m2 2.5 m)

E' = 1.02 106 J m-3