Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ciſſim (per motus Legem tertiam) æqualem ab eadem reactionem
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patiantur, hoc eſt, æqualiter reſiſtantur: manifeſtum eſt etiam
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quod in ejuſdem denſitatis Fluidis Elaſticis, ubi velociſſime mo
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ventur, æquales ſint eorum reſiſtentiæ quam proxime; ſive Fluida
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illa ex particulis craſſioribus conſtent, ſive ex omnium ſubtiliſſi
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mis conſtituantur. </
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>Ex Medii ſubtilitate reſiſtentia projectilium ce
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lerrime motorum non multum diminuitur.
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DE MOTU
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CORPORUM.</
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Corol.
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6. Hæc omnia ita ſe habent in Fluidis, quorum vis Ela
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ſtica ex particularum viribus centrifugis originem ducit. </
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vis illa aliunde oriatur, veluti ex particularum expanſione ad inſtar
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Lanæ vel ramorum Arborum, aut ex alia quavis cauſa, qua motus
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particularum inter ſe redduntur minus liberi: reſiſtentia, ob mi
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norem Medii fluiditatem, erit major quam in ſuperioribus Co
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rollariis.
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PROPOSITIO XXXIV. THEOREMA XXVIII.
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Si Globus & Cylindrus æqualibus diametris deſcripti, in Medio
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raro ex particulis æqualibus & ad æquales ab invicem diſtan
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tias libere diſpoſitis conſtante, ſecundum plagam axis Cylindri,
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æquali cum velocitate moveantur: erit reſiſtentia Globi duplo
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minor quam reſiſtentia Cylindri.
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>Nam quoniam actio Medii in corpus eadem eſt (per Legum
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Corol, 5.) ſive corpus in Medio quieſcente moveatur, ſive Medii
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particulæ eadem cum velocitate impingant in corpus quieſcens:
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conſideremus corpus tanquam quieſcens, & videamus quo impetu
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urgebitur a Medio movente.
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Deſignet igitur
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ABKI
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cor
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pus Sphæricum centro
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C
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ſe
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midiametro
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CA
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deſcriptum,
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& incidant particulæ Medii
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data cum velocitate in cor
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pus illud Sphæricum, ſecun
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dum rectas ipſi
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AC
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paralle
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las: Sitque
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FB
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ejuſmodi
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recta. </
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LB
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ſemidiametro
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CB
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æqualis,
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& ducatur
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BD
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quæ Sphæram tangat in
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B.
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In
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KC
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&
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BD
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de-</
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