Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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conjunctim. </
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<
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>Igitur ut partes illæ ſint totis proportionales, debe
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bit reſiſtentia & tempus conjunctim eſſe ut motus. </
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>Proinde tem
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pus erit ut motus directe & reſiſtentia inverſe. </
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<
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>Quare temporam
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particulis in ea ratione ſumptis, corpora amittent ſemper parti
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culas motuum proportionales totis, adeoque retinebunt velocita
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tes in ratione prima. </
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<
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>Et ob datam velocitatum rationem, deſcri
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bent ſemper ſpatia quæ ſunt ut velocitates primæ & tempora con
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junctim.
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Q.E.D.
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LIBER
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SECUNDUS.</
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Corol.
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1. Igitur ſi æquivelocibus corporibus reſiſtitur in duplicata
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ratione diametrorum: Globi homogenei quibuſcunque cum velocita
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tibus moti, deſcribendo ſpatia diametris ſuis proportionalia, amit
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tent partes motuum proportionales totis. </
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<
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>Motus enim Globi cu
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juſque erit ut ejus velocitas & Maſſa conjunctim, id eſt, ut veloci
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tas & cubus diametri; reſiſtentia (per Hypotheſin) erit ut quadra
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tum diametri & quadratum velocitatis conjunctim; & tempus (per
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hanc Propoſitionem) eſt in ratione priore directe & ratione poſte
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riore inverſe, id eſt, ut diameter directe & velocitas inverſe; ad
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eoque ſpatium (tempori & velocitati proportionale) eſt ut dia
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meter. </
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Corol.
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2. Si æquivelocibus corporibus reſiſtitur in ratione ſeſquial
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tera diametrorum: Globi homogenei quibuſcunque cum velocitati
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bus moti, deſcribendo ſpatia in ſeſquialtera ratione diametrorum,
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amittent partes motuum proportionales totis. </
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Corol.
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3. Et univerſaliter, ſi æquivelocibus corporibus reſiſtitur in
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ratione dignitatis cujuſcunQ.E.D.ametrorum: ſpatia quibus Globi
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homogenei, quibuſcunque cum velocitatibus moti, amittent partes
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motuum proportionales totis, erunt ut cubi diametrorum ad digNI
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tatem illam applicati. </
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>Sunto diametri D & E; & ſi reſiſtentiæ,
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ubi velocitates æquales ponuntur, ſint ut D
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n
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& E
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n
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: ſpatia quibus
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Globi quibuſcunque cum velocitatibus moti, amitteus partes mo
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tuum proportionales totis, erunt ut D
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3-
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& E
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3-
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. </
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bendo ſpatia ipſis D
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3-
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& E
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3-
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proportionalia, retinebunt veloci
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tates in eadem ratione ad invicem ac ſub initio. </
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Corol.
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4. Quod ſi Globi non ſint homogenei, ſpatium a Globo
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denſiore deſcriptum augeri debet in ratione denſitatis. </
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<
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>Motus
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enim, ſub pari velocitare, major eſt in ratione denſitatis, & tempus
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(per hanc Propoſitionem) augetur in ratione motus directe, ac
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ſpatium deſcriptum in ratione temporis. </
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