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6. (5 pts) Soit un fil de cuivre de longueur L = 10 m et de rayon 1 x 10 m. Quelle est la variation

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6. (5 pts) Soit un fil de cuivre de longueur L = 10 m et de rayon 1 x 10 m. Quelle est la variation de sa longueur AL lorsqu'il supporte une masse de 100 kg (la constante d'acceleration gravitationnelle g = 10 m/s2)? Le module de Young du cuivre = 1.4 x 1011 N/m2. Encerclez la reponse la plus proche. (a) 0.7 nm (c) 70 nm (e) 5 mm (9) 2 cm (b) 7 nm (d) 4 mm (f) 1 cm (h) 2 3 cm

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