King Morgan
09/28/2024 · High School

1.14 Le plateau d'une platine de tourne-disque de disc-jockey est animé d'un mouvement circulaire uniforme, à raison de \( 33.3 \mathrm{tr} / \mathrm{min} \). 1) Exprimer les composantes du vecteur-accélération dans la base de Freinet pour un point p situé a une distance r du centre du plateau. 2) Calculer la valeur de l'accélération pour \( \mathrm{r}=10 \mathrm{~cm} \).

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1) Les composantes du vecteur-accélération dans la base de Freinet sont : \( \vec{a} = -r \cdot \omega^2 \hat{r} \). 2) L'accélération pour \( r = 10 \, \text{cm} \) est environ \( 1.218 \, \text{m/s}^2 \).

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