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Mathematics, 17.11.2020 21:00 mlguerrero12

Un charpentier veut monter une poutre pour construire une charpente en haut d'une colline, il doit pour cela tirer la poutre sur la distance AB qui est une pente inclinée d'un angle de 15° AB = 30 mètres et la masse de la poutre est 60 Kg.
Durant la montée, la poutre es soumise a plusieurs forces dont son poids P. On rapelle que P=mg avec g=9.8 N/Kg. On définit le travail W d'une force F sur un déplacement rectiligne AB par W = F. AB ou W est en (J), F en Newton et Ab en mètres.
Calculer le travail du poids de la poutre sur la distance AB.

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Un charpentier veut monter une poutre pour construire une charpente en haut d'une colline, il doit p...
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