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Un cable qui pse 10 N/m sert remonter 50 N de minerai du fond d'un puits 120 metres plus bas_ (i) Supposons qu' un

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Un cable qui pse 10 N/m sert remonter 50 N de minerai du fond d'un puits 120 metres plus bas_ (i) Supposons qu' un moment donn, mtres de cable ait t remonts la surface. Alors le travail pour en remonter mtres de plus est environ w (x) _ Quel est w (x) ? Exprimez votre rponse par une formule_ (ii) Quel est en Joules, le travail requis pour remonter le minerai la surface? Arrondir la rponse 3 chitfres significatifs_ Rponse: Number Joules

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