Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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enim certum, & determinatum gradum velocitatis à
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natura ipſis aſſignatum, non verò inſtantaneum. </
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verò
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refragatur celebris illa Ariſtotelis de
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monſtratio vbi contendit, quod motus in vacuo fie
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ri deberet non in tempore, ſed in inſtanti. </
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operæpretium ad examen vocare tale Ariſtotelicum
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ratiociniũ
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, quod
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pẽdet
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ex huiuſmodi ſuppoſitione.
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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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4. phyſ. c.8.</
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<
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Eiuſdẽ
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mo
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bilis veloci
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tates reci
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procè pro
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port ionales
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ſunt denſita
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tibus fluideo
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rum in qui
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bus moui
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tur. </
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<
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">Quod quotieſcumque idem mobile fertur per duo
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media fluida, tunc eorum denſitates, ſeù reſiſtentiæ
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proportionales reciprocè ſunt eiuſdem mobilis ve
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locitatibus, quas in prædictis fluidis exercet. </
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poſito quod pila ferrea verb. </
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tiua ex ſui natura feratur per aquam, & per acrem, ſi
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denſitas, & reſiſtentia ad diuiſionem aquæ centies
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maior eſſet reſiſtentia ipſius aeris, aſſumit Philoſo
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phus moueri pilam ferream per aerem velocitate
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cẽ-ties
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ties</
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maiori, quàm per aquam fertur, ſcilicèt ſi motus
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fiant temporibus æqualibus, per
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aerẽ
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excurrere ſpa
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tium centuplum, quàm per aquam, & ſi ſpatia exa
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cta æqualia fuerint, tempus motionis per aquam cen
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tuplo prolixius, & tardius eſſe, quàm per aerem. </
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<
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locitatem cuiuslibet mobilis in vacuo eſſe
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, </
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& inſtantaneam. </
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greſſus ſi prædictum
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à philoſopho aſſump
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tum eſſet firmum, & ſtabile, ſed iam clariſs. </
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<
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leus falſum eſſe euidentiſſimè demonſtrauit in noua
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eius ſcientia mechanica dialogo primo. </
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