Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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vis qua planum quodvis
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mHM
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trahit punctum
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C
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eſt reciproce ut
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CH
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n-2
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.
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In plano
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mHM
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capiatur longitudo
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HM
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ipſi
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CH
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re
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ciproce proportionalis, & erit vis illa ut
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HM.
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Similiter in planis ſin
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gulis
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lGL, nIN, oKO,
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&c. </
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<
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>capiantur longitudines
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GL, IN, KO,
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&c. </
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ipſis
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CG
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n-2
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, CI
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n-2
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, CK
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n-2
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,
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&c. </
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<
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>reciproce proportionales; & vi
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res planorum eorundem erunt ut longitudines captæ, adeoque
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ſumma virium ut ſumma longitudinum, hoc eſt, vis Solidi totius ut
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area
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GLOK
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in infinitum verſus
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OK
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producta. </
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<
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>Sed area illa (per
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notas quadraturarum methodos) eſt reciproce ut
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CG
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n-3
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,
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& prop
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terea vis Solidi totius eſt reciproce ut
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CG
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n-3
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E. D.
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LIBER
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PRIMUS.</
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Cas.
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2. Collocetur jam corpuſculum
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C
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ex parte plani
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lGL
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in
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tra Solidum, & capiatur diſtantia
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CK
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æqualis diſtantiæ
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CG.
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Et So
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lidi pars
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LGloKO,
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planis parallelis
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lGL, oKO
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terminata, cor
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puſculum
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C
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in medio ſitum nullam in partem trahet, contrariis op
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poſitorum punctorum actionibus ſe mutuo per æqualitatem tollenti
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bus. </
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>Proinde corpuſculum
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C
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ſola vi Solidi ultra planum
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OK
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ſiti tra
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hitur. </
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<
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>Hæc autem vis (per Caſum primum) eſt reciproce ut
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CK
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n-3
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,
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hoc eſt (ob æquales
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CG, CK
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) reciproce ut
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CG
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n-3
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. </
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E. D.
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Corol.
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1. Hinc ſi Solidum
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LGIN
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planis duobus infinitis pa
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rallelis
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LG, IN
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utrinque terminetur; innoteſcit ejus vis attra
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ctiva, ſubducendo de vi attractiva Solidi totius infiniti
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LGKO
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vim attractivam partis ulterioris
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NICO,
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in infinitum verſus
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KO
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productæ. </
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Corol.
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2. Si Solidi hujus infiniti pars ulterior, quando attractio e
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jus collata cum attractione partis citerioris nullius pene eſt momen
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ti, rejiciatur: attractio partis illius citerioris augendo diſtantiam de
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creſcet quam proxime in ratione poteſtatis
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CG
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n-3
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.
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Corol.
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3. Et hinc ſi corpus quodvis finitum & ex una parte pla
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num trahat corpuſculum e regione medii illius plani, & diſtantia
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inter corpuſculum & planum collata cum dimenſionibus corpo
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ris attrahentis perexigua ſit, conſtet autem corpus attrahens ex
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particulis homogeneis, quarum vires attractivæ decreſcunt in
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ratione poteſtatis cujuſvis pluſquam quadruplicatæ diſtantiarum;
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vis attractiva corporis totius decreſcet quamproxime in ratione
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poteſtatis, cujus latus ſit diſtantia illa perexigua, & Index terna
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rio minor quam Index poteſtatis prioris. </
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<
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>De corpore ex particulis
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conſtante, quarum vires attractivæ decreſcunt in ratione poteſtatis
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triplicatæ diſtantiarum, aſſertio non valet; propterea quod, in hoc
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caſu, attractio partis illius ulterioris corporis infiniti in Corollario
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ſecundo, ſemper eſt infinite major quam attractio partis citerioris. </
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