Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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tinget in aqua deſcendente EF quæ videtur habere
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nedùm vim propriæ grauitatis, ſed inſuper
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quo deorsùm fertur, ſicuti ſaxum, quod deorsùm̨
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proijcitur, vim, & percuſſionem infert nedum men
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ſuratam à gradu eius ponderis, ſed etiam ab impe
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tu eius deſcenſiuo; qua propter vis, quæ ſubtrahitur
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ab aqua
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FG, ſuperadditur grauitati aquæ
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deſcendenti EF, & ſic duplicatur vis eiuſdem aquæ
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deſcendentis qua fundum vaſis BC comprimitur;
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igitur id, quod ſubtrahitur ab aqua aſcendente FG
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ſuperaddatur ponderi aquæ deſcendentis EF com
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penſabitur defectus cum additamento impetus
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cõ-preſſiui
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preſſiui</
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, proindeque non imminuetur pondus totius
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aquæ in vaſe AC contentæ, & hæc erit cauſa, quare
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etiam poſt aquæ agitationem pondus eius in librą
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non alteratur, nec imminuitur. </
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens ponde
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rat.</
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PROP. XXXVII.
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Reijcitur difficultas contra præcedentem propoſitionem
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adducta.
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<
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oſtẽ-di
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di</
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poteſt, primò experientia, ſecundò ratione.
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<
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">Quoad primum, ſuſpendatur vas aqueum AC duobus
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filis AH, DL alligatis in extremitatibus eiuſdem li
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bræ HL radiorum æqualium, ſuſpendaturque libra
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cum vaſe ab illius centro I, manifeſtum eſt, quando
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aqua quieſcit, nec agitatur, ſi eri æquilibrium, quią
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ſcilicèt centrum grauitatis M totius vaſis, & aquæ in-</
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