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Michonne15
@Michonne15
May 2019
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Bonsoir, j'ai besoin de votre aide pour cet exercice s'il vous plaît!! Il fait parti d'un devoir maison que je dois rendre demain.. je bloque. Aidez-moi!
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scoladan
Verified answer
Bonjour,
1 et 2) cours
3) E = Ec x V x ρ
E = 47,3.10⁶ x 25 x 0,730 = 863 225 000 J
(Dans le moteur thermique)
4) Ef = Px t
Ef = 5000 x 14 x 3600 = 252 000 000 J
5) Pertes : E - Ef = 611 225 000 J
6) Rendement η = Ef/E = 252 000 000/863 225 000 = 0,29
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Michonne15
Pour la 3, comment on sait que c'est dans le moteur thermique ?
scoladan
C'est là que l'essence est transformée en énergie mécanique
Michonne15
D'accord merci !
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Lista de comentários
Verified answer
Bonjour,1 et 2) cours
3) E = Ec x V x ρ
E = 47,3.10⁶ x 25 x 0,730 = 863 225 000 J
(Dans le moteur thermique)
4) Ef = Px t
Ef = 5000 x 14 x 3600 = 252 000 000 J
5) Pertes : E - Ef = 611 225 000 J
6) Rendement η = Ef/E = 252 000 000/863 225 000 = 0,29