Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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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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">Hinc deducitur, quòd figura acuminata eiuſdem̨
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corporis grauis omninò inutilis eſt, nec motum eius
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facilem reddit, quando motus fieri debet in ſpatio
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prorsùs inani, non verò in medio fluido quieſcente; </
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propterea quòd vis motiua eius naturalis nullam me
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dij reſiſtentiam ſuperare debet, ſcilicèt neque medij
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fluidi quieſcentis ibi non exiſtentis, inertiam, aut
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grauitatem, contiguitatem, aut glutem ſuperare de
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bet, ſcilicèt quando nihil ei obſiſtit, nec eius
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impetũ
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,
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aut progreſſum impedire, & retardare poteſt.
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III.</
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IV.</
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<
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">E contrà figura obtuſa, & ampla eiuſdem corpo
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ris grauis nihil nocet, nec planè retardare poteſt mo
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tum eiuſdem corporis grauis in vacuo, quia nimirum
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nihil ei reſiſtit, neque enim
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inertiã
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medij fluidi quie
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ſcentis ibi non exiſtentis ſuperare debet, id è ſuo lo
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co expellendo, neque eius grauitatem,
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contiguitatẽ
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,
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aut gluten ſua vi motiua vincere debet. </
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V.</
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non ſint æqua
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biles, ſed vniformiter acceleratæ, ideò quando com
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parantur inter ſe gradus velocitatum duorum corpo
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rum deſcendentium, intelligi ſemper debent gradus
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initiales, ſcilicèt illi, qui ab eodem termino quietis
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temporibus æqualibus exercentur, & vniformi pro
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greſſu creſcunt. </
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poſitiones. </
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