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Exercice N°1:
Un cheval met 1h7min58s pour relier villages distants de 35km. Il tire un chariot de masse 1,2t avec une
force de traction F=1,37.10³N. Calcule:
1. La vitesse moyenne de ce cheval en m/s et en km/h.
Le travail mécanique effectué par cette force.
La puissance mécanique développée en cheval-vapeur.
Calcule le poids du chariot (on donne g-10 N/kg). Déduis-en son travail.
Sagot :
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