Frodon possède un anneau en électrum, un alliage fait avec de l'or et d'argent : – l'or a une masse volumique de 19 300 kg / m3
– l'argent a une masse volumique de 10 500 kg / m3
Il fut forgé par Sauron, qui utilisa 2,8g d'or et 1,5g d'argent. Intrigué par la sensation de lourdeur de l'anneau,
Frodon mesura sa masse et son volume.
1. Quelle masse trouve-t-il pour l'anneau unique ?
2. Quelle est la masse volumique de l'anneau, le volume mesuré étant de 0,15mL ?
Conversion : 1 m3
= 1000 L
3. Pourquoi Frodon, lorsqu'il le porte, le trouve plus lourd qu'un anneau en or ou en argent ?

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