Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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prædicti mobilis, & perindè ſe habet, ac ſi in vacuo
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moueretur. </
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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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">Modò quia impedimentum reale, quod infert aer
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quieſcens ſua denſitate motui eiuſdem corporis ad
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nullum, ſeù ad priuationem impedimenti aeris
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fluẽ-tis
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tis</
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, ſeu venti ſecundi, (qui in diminutam eius veloci
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tatem non minùs, ac vacuum excurrere ſinit) habebit
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eamdem proportionem infinitam, ſeù eumdem defe
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ctum proportionis, quam habet plenum ad vacuum̨
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(ex aſſumpto Peripatetico) ergo velocitas finita, &
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temporanea eiuſdem mobilis in aere quieſcentę
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nullam quoque proportionem habebit ad
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velocitatẽ
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eius in aere à vento ſecundo agitato, ideoque in ip
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ſo infinita, &
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velocitate moueretur, quod
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eſt falſum, & contra experientiam. </
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id
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">Hinc ſequitur,
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quòd idem mobile quod in aere ſtagnante quatuor
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gradibus velocitatis ferebatur, in vacuo poſtea vbi
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nullum impedimentum adeſt non mouebitur infinitè
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velociùs, & in
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. </
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<
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id
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">Et ratio eſt, quia
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medij fluidi retardans mobilis velocitatem non ha
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bet infinitam energiam, ſed eſt certi, ae finiti roboris,
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& ideo infinitatem impetus, quam in vacuo exercere
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deberet minimè deſtruere poſſet, nam eadem vis, &
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energia infinita requiritur, vt quantitas finita in in
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finitum extendatur, ac è contrà requiritur vt lineą
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verè infinita adeò decurtetur, vt extenſionem
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finitã
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acquirat; in vtroque enim caſu
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, & intercape
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do infinita eſt, & propterea exigit infinitam
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virtutẽ
">virtutem</
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. </
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