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Limouna
@Limouna
April 2019
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ENERGIE CINETIQUE 3EME
Salut tout le monde j'ai pas trop compris comment on fesait le calcul.. pour 30km/h pour un véhicule de 1300kg
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hamsits61
Salut!
Tu dois retenir que l'énergie cinétique se calcule comme suit:
Ecin = mv²/2
m s'exprime en kg: m= 1300kg
v s'exprime en m/s v = 30km/h= 8.33m/s
Finalement, on a Ecin = 1300x(8.33)²/2 = 45102.79 J
Bonne soirée!
1 votes
Thanks 1
Jeremy26i
Salut,
La formule de calcul de l'énergie cinétique est :
Ec =
m v²
Ici on a : m = 1300 kg
v = 30 km/h =
≈ 8.33 m/s
Donc Ec =
* 1300 * 8.33² ≈ 45102.8 J (Joule)
Voilà ! :) A bientôt ^^
2 votes
Thanks 2
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Lista de comentários
Tu dois retenir que l'énergie cinétique se calcule comme suit:
Ecin = mv²/2
m s'exprime en kg: m= 1300kg
v s'exprime en m/s v = 30km/h= 8.33m/s
Finalement, on a Ecin = 1300x(8.33)²/2 = 45102.79 J
Bonne soirée!
La formule de calcul de l'énergie cinétique est :
Ec = m v²
Ici on a : m = 1300 kg
v = 30 km/h = ≈ 8.33 m/s
Donc Ec = * 1300 * 8.33² ≈ 45102.8 J (Joule)
Voilà ! :) A bientôt ^^