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Three young boys in a science lab, one measuring a metal cylinder in water with calipers, a formula V=πr²h on a blackboard, and various lab equipment on the table.

je voudrais une image qui réflète l'activité expériemental décrite ci-contre Voici une proposition de **TP de Physique-Chimie pour une classe de Première Bac Pro MSPC**, mêlant mesures, calculs géométriques, masse volumique et principe d'Archimède. # TP : Pourquoi certains objets flottent-ils et d'autres coulent-ils ? ## Problématique Lorsque l'on place un objet dans l'eau, certains flottent alors que d'autres coulent. **Question :** Comment expliquer ce phénomène à partir de la masse volumique des matériaux et du principe d'Archimède ? --- # 1. Rappel : Principe d'Archimède Tout corps plongé dans un liquide subit une force verticale dirigée vers le haut appelée **poussée d'Archimède**. Cette force est égale au poids du volume de liquide déplacé. **Conséquences :** * Si l'objet est plus dense que l'eau, il coule. * Si l'objet est moins dense que l'eau, il flotte. La masse volumique de l'eau est : [ \rho_{eau}=1,0\ g/cm^3 ] --- # 2. Matériel * 1 cylindre métallique inconnu * Pied à coulisse ou règle graduée * Balance * Éprouvette graduée * Eau du robinet * Calculatrice --- # 3. Mesure du volume géométrique du cylindre ## Mesures Mesurer : * le diamètre (d) * la hauteur (h) Calculer ensuite le rayon : [ r=\frac{d}{2} ] ### Formule du volume d'un cylindre genui{"math_block_widget_always_prefetch_v2":{"content":"V=\pi r^2 h"}} avec : * (V) : volume (cm³) * (r) : rayon (cm) * (h) : hauteur (cm) ### Tableau de mesures | Grandeur | Valeur | | ------------------ | ------ | | Mehr sehen

#science #education #classroom

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