Physics, 12.11.2020 01:50, stinematesa
Exercice 20 : Un ballon sous l'eau.
Anne s'amuse à maintenir un ballon sous l'eau pour le relâcher et le voir jaillir hors
de l'eau. On s'intéresse aux forces qui s'exercent sur le ballon juste avant qu'Anne
ne le relâche. La force d'attraction de la Terre sur le ballon est de 4,4 N et Anne
exerce une force de 52 N pour maintenir le ballon vers le bas. L'eau exerce une force
de poussée sur le ballon. Cette force, appelée poussée d'Archimède, est celle qui
permet au ballon de flotter.
Answers: 3
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Exercice 20 : Un ballon sous l'eau.
Anne s'amuse à maintenir un ballon sous l'eau pour le relâcher...
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