Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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tione diſtantiæ. </
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>Fingatur quod vis comprimens ſit in duplicata
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ratione denſitatis, & gravitas reciproce in ratione duplicata diſtan
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tiæ, & denſitas erit reciproce ut diſtantia. </
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<
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re longum eſſet. </
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DE MOTU
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CORPORUM</
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PROPOSITIO XXIII. THEOREMA XVIII.
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Si Fluidi ex particulis ſe mutuo fugientibus compoſiti denſitas ſit
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ut compreſſio, vires centrifugæ particularum ſunt reciproce pro
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portionales diſtantiis centrorum ſuorum. </
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ticulæ viribus quæ ſunt reciproce proportionales diſtantiis cen
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trorum ſuorum ſe mutuo fugientes componunt Fluidum Elaſti
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cum, cujus denſitas est compreſſioni proportionalis.
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<
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>Includi intelligatur Fluidum in ſpatio cubico
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ACE,
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dein com
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preſſione redigi in ſpatium cubicum minus
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ace
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; & particularum,
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ſimilem ſitum inter ſe in utro
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que ſpatio obtinentium, diſtan
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tiæ erunt ut cuborum latera
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AB, ab
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; & Medii denſitates
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reciproce ut ſpatia continentia
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AB cub.
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&
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ab cub.
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In latere
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cubi majoris
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ABCD
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capiatur
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quadratum
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DP
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æquale lateri
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cubi minoris
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db
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; & ex Hypo
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theſi, preſſio qua quadratum
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DP
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urget Fluidum incluſum, erit ad
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preſſionem qua latus illud quadratum
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db
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urget Fluidum incluſum
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ut Medii denſitates ad invicem, hoc eſt, ut
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ab cub.
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ad
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ABcub.
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Sed
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preſſio qua quadratum
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DB
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urget Fluidum incluſum, eſt ad preſſi
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onem qua quadratum
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DP
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urget idem Fluidum, ut quadratum
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DB
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ad quadratum
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DP,
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hoc eſt, ut
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AB quad.
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ad
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ab quad.
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Ergo, ex
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æquo, preſſio qua latus
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DB
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urget Fluidum, eſt ad preſſionem qua
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latus
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db
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urget Fluidum, ut
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ab
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ad
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AB.
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Planis
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FGH, fgh,
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per
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media cuborum ductis, diſtinguatur Fluidum in duas partes, & hæ
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ſe mutuo prement iiſdem viribus, quibus premuntur a planis
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AC, ac,
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hoc eſt, in proportione
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ab
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ad
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AB:
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adeoque vires centrifugæ, qui
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bus hæ preſſiones ſuſtinentur, ſunt in eadem ratione. </
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<
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particularum numerum ſimilemque ſitum in utroque cubo, vires
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quas particulæ omnes ſecundum plana
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FGH, fgh
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exercent in om-</
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