Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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fecundum) compoſitæ, ſimiles habebunt determinationes, perin
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de ac ſi centra inter particulas ſimiliter ſita reſpicerent; & erunt
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vires illæ totæ ad invicem ut vires ſingulæ componentes, hoc eſt,
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ut correſpondentium particularum diametri inverſe, & quadrata
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velocitatum directe: & propterea efficient ut correſpondentes par
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ticulæ figuras ſimiles deſcribere pergant. </
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>Hæc ita ſe habebunt per
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Corol. 1, & 8 Prop. IV, Lib. 1. ſi modo centra illa quieſcant.
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Sin moveantur, quoniam ob tranſlationum ſimilitudinem, ſimiles
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manent eorum ſitus inter Syſtematum particulas; ſimiles indu
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centur mutationes in figuris quas particulæ deſcribunt. </
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>Similes igi
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tur erunt correſpondentium & ſimilium particularum motus uſ
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que ad occurſus ſuos primos, & propterea ſimiles occurſus, & ſi
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miles reflexiones, & ſubinde (per jam oſtenſa) ſimiles motus in
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ter ſe donec iterum in ſe mutuo inciderint, & ſic deinceps in in
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finitum.
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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. Hinc ſi corpora duo quævis, quæ ſimilia ſint & ad
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Syſtematum particulas correſpondentes ſimiliter ſita, inter ipſas
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temporibus proportionalibus ſimiliter moveri incipiant, ſintque
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eorum magnitudines ac denſitates ad invicem ut magnitudines ac
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denſitates correſpondentium particularum: hæc pergent tempori
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bus proportionalibus ſimiliter moveri. </
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tium majorum Syſtematis utriuſque atque particularum.
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Corol.
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2. Et ſi ſimiles & ſimiliter poſitæ Syſtematum partes om
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nes quieſcant inter ſe: & earum duæ, quæ cæteris majores ſint, &
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ſibi mutuo in utroque Syſtemate correſpondeant, ſecundum lineas
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ſimiliter ſitas ſimili cum motu utcunque moveri incipiant: hæ ſi
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miles in reliquis Syſtematum partibus excitabunt motus, & pergent
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inter ipſas temporibus proportionalibus ſimiliter moveri; atque
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adeo ſpatia diametris ſuis proportionalia deſcribere.
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PROPOSITIO XXXIII. THEOREMA XXVII.
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Iiſdem poſitis, dico quod Syſtematum partes majores reſiſtituntur
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in ratione compoſita ex duplicata ratione velocitatum ſuarum &
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duplicata ratione diametrorum & ratione denſitatis partium
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Syſtematum.
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<
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>Nam reſiſtentia oritur partim ex viribus centripetis vel centri
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fugis quibus particulæ Syſtematum ſe mutuo agitant, partim ex
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occurſibus & reflexionibus particularum & partium majorum. </
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