Question: 3. Benson Vol. 1 Ch. 16 Problme 2 : P2. 4. Benson Vol. 1 Ch. 16 Problme 4 . (II) Un ballon air chaud

3. Benson Vol. 1 Ch. 16 Problme 2 : P2. 4. Benson Vol. 1 Ch. 16 Problme 4 . (II) Un ballon air chaud a un volume de 1200 m3. La temprature de l'air ambiant est gale 15 oc et la pression 1 atm. Ouelle valeur doit atteindre la temprature de l'air dans le ballon pour que celui-ci parvienne tout juste soulever 200 kg (y compris la masse du ballon) ? On suppose que la masse molaire effective des molcules de l'air est gale 29 g/mol. (I) On remplit un ballon sphrique en verre de 50 mL d'eau 5 oc. Le col cylindrique du ballon a un rayon de 0,15 cm et il est initialement vide. De quelle hau- teur s'lve le niveau de l'eau dans le col 35 oc? On tiendra compte de l'effet de dilatation du ballon en verre.

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