Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ponderis ſolidi DE ſupra grauitatem aquæ F quæ ſit
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æqualis mole ipſi DE, ſemper idem eſt in quacumque
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aquæ profunditate ſolidum collocetur, ſitque pon
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dus E exceſſus quo pondus DE ſuperat grauitatem̨
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aquæ F, igitur conatus, vis, & impetus, quo ſolidum
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DE deſcendit infra
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aquã
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menſuratur à vi
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E. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LII.
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Vis motiua qua ſolidum leuius ſpecie, quàm fluidum aſcen
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dit æqualis est exceſſui leuitatis ſolidi ſupra leuita
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tem fluidi ei æqualis mole.
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<
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">E Contrà, ſi ſupponamus, quod lignum DE pari
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terque aqua F careant grauitate, ſed
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tãtummo-dò
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dò</
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à vi leuitatis informentur, & ambo impulſum, &
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impetum faciant ſursùm conenturque aſcendere,
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ſecùs oſtendetur, quòd in libra, ſeù rota perpetua
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ligni DE maior leuitas præualebit ſuperabitque mi
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norem leuitatem fluidi collateralis F, proindeque
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libra inflectetur ab A versùs R aſcendendo tanta vi,
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quanta eſt differentia, ſeù exceſſus E, quo leuitas li
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gni ſuperat aquæ leuitatem. </
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PROP. LIII.
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Vis motiua qua leue corpus in fluido graui aſcendit æqualis
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eſſe debet ſummæ lenitatis ſolidi, & grauitatis
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fluidi.
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<
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">SI verò variata hypoteſi ponamus
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F leue,
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& ſursùm ab intrinſeco principio impelli, & mo-</
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