Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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non poterit reperiri aliud corpus quod in vacuo æ
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quali tarditate feratur, ac illud in pleno excurrebat;
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neque hoc incredibile alicui videri poteſt, niſi ijs, qui
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à falſa perſuaſione præoccupati cenſent corpora inę
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qualia in vacuo inæqualibus velocitatibus moueri
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debere, quod falſum eſſe demonſtrabitur. </
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Quintum re
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ſpondetur.</
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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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">Ad ſextum, ſimilitèr aduerſarij hallucinatio pendet
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ex falſa ſuppoſitione, quòd velocitates eiuſdem mo
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bilis habeant proportionem contrario
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reſpondentẽ
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reſiſtentijs mediorum fluidorum, verum eſt maiorem
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medij reſiſtentiam magis velocitatem eiuſdem gra
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uis retardare, ſed non tamen proportionalitèr hu
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iuſmodi retardatio efficitur, vt ſupra demonſtraui
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mus; & hìc mirari licet, quòd aduerſarius neglectą
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Galilei demonſtratione tantummodò affert nouas
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difficultates, qui tamen tenebatur demonſtrationem
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adductam redarguere, & eius paralogiſmum indica
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re, quod non præſtitit. </
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Sexto argu
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mento re
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ſpondetur.</
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<
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">Ad argumentum verò dico quòd ſupponendo ple
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num denſius magis velocitatem mobilis retardarę,
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quàm plenum rarum, pariterque poſito, plenum ad
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vacuum nullam proportionem habere, non indè ſe
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quitur velocitatem, quam ſaxum in vacuo exercet,
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eſſe infinitè maiorem illo impetu, quo in aqua moue
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retur, neque hanc velocitatem eſſe illa infinitè tar
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diorem, poſſet enim habere proportionem finitam,
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propterea quod diſtantia inter reſiſtentiam pleni, &
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nullam vacui reſiſtentiam non eſt quid infinitum, ſed
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menſuratur ab entitate finita pleni reſiſtentis, quą </
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