Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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præterea quia vniuerſum corpus BC, eiuſque portio
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B ſunt ſimilia, & eiuſdem grauitatis ſpecificæ, & ſo
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lummodò moles inæquales
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ſcilicèt eorum abſoluta pondera in
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æqualia ſunt, igitur ablatis om
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nibus impedimentis, ſcilicèt iņ
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vacuo, eadem velocitate deſcen
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det integrum corpus BC atque eius
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portio B: oſtenſa autem priùs fuere
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duo corpora A, & B in vacuo æquè velocia, igitur cor
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pus BC, atque A, erunt quoque in vacuo æquè velo
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cia, quod erat demonſtrandum. </
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Pro. 211.</
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Cap. 10. de
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æquitempo
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ranea natu
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rali veloci
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tate
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grauiũ
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.</
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Pro. 209. &
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210.</
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<
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">Ex hiſce propoſitionibus deducitur, quod omnią
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corpora grauia, quomodocumque inter ſe differant
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pondere, magnitudine, & figura, apta nata ſunt ex
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ſui natura deorsùm
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deſcẽdere
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pari velocitate, & hoc
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procùl dnbio contingeret, quando nil prorsùs à me
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dio fluido impedirentur, quod ſolummodò verifica
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ri poſſetin ſpatio prorsùs inani, vbi ſi feſtuca, vel
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pluma, & ingens maſſa ferrea ab eodem termino de
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ſcenſum inchoarent, ſemper pari paſſu, & æquabili
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motu excurrerent, neque aliquando ferrum
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anticiparet. </
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<
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">Propoſitio profectò admirabilis, quæ
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paradoxum cenſeri potuerat cùm primùm à Galileo
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coniecturalibus
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tãtummodò
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rationibus prolata fuit,
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quæ modò cum euidentia geometrica demonſtratą
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fuerit, nullam anſam dubitandi relinquit. </
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