Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MOTU
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CORPORUM</
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<
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>Porro præcedentis propoſitionis & corollariorum ejus beneficio,
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colligitur etiam proportio vis centripetæ ad vim quamlibet notam,
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qualis eſt ea Gravitatis. </
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>Nam ſi corpus in circulo Terræ concen
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trico vi gravitatis ſuæ revolvatur, hæc gravitas eſt ipſius vis centri
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peta. </
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<
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>Datur autem, ex deſcenſu gravium, & tempus revolutionis
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unius, & arcus dato quovis tempore deſcriptus, per hujus Corol. </
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IX. </
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<
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>Et hujuſmodi propoſitionibus
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Hugenius,
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in eximio ſuo Tracta
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tu
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de Horologio Oſcillatorio,
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vim gravitatis cum revolventium vi
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ribus centrifugis contulit. </
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<
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>Demonſtrari etiam poſſunt præcedentia in hunc modum. </
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<
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>In cir
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culo quovis deſcribi intelligatur Polygonum laterum quotcunque. </
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Et ſi corpus, in polygoni lateribus data cum velocitate movendo,
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ad ejus angulos ſingulos a circulo reflectatur; vis qua ſingulis re
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flexionibus impingit in circulum erit ut ejus velocitas: adeoque
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ſumma virium in dato tempore erit ut velocitas illa & numerus re
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flexionum conjunctim: hoc eſt (ſi polygonum detur ſpecie) ut longi
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tudo dato illo tempore deſcripta & longitudo eadem applicata ad
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Radium circuli; id eſt, ut quadratum longitudinis illius applicatum
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ad Radium: adeoque, ſi polygonum lateribus infinite diminutis co
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incidat cum circulo, ut quadratum arcus dato tempore deſcripti ap
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plicatum ad radium. </
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>Hæc eſt vis centrifuga, qua corpus urget cir
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culum: & huic æqualis eſt vis contraria, qua circulus continuo re
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pellit corpus centrum verſus. </
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PROPOSITIO. V. PROBLEMA I.
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Data quibuſcunQ.E.I. locis velocitate, qua corpus figuram datam vi
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ribus ad commune aliquod centrum tendentibus deſcribit, centrum
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illud invenire.
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<
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>Figuram deſcriptam tangant rectæ tres
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PT, TQV, VR
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in
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punctis totidem
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P, Q, R,
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concurrentes in
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T
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&
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V.
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Ad tangentes
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erigantur perpendicula
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PA, QB, RC,
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velocitatibus corporis in
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punctis illis
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P, Q, R
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a quibus eriguntur reciproce proportionalia;
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id eſt, ita ut ſit
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PA
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ad
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QB
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ut velocitas in
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Q
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ad velocitatem in
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P,
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&
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QB
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ad
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RC
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ut velocitas in
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R
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ad velocitatem in
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Per
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perpendiculorum terminos
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A, B, C
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ad angulos rectos ducantur
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AD,
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DBE, EC
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concurrentes in
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D
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&
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E:
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Et actæ
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TD, VE
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concur
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rent in centro qæſito
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S.
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