Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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penduli quam habet reſiſtentia ad gravitatem, erit
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DK
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exponens </
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reſiſtentiæ. </
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<
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C
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& intervallo
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CA
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vel
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CB
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conſtruatur Semi
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circulus
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BEeA.
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Deſcribat autem corpus tempore quam minimo
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ſpatium
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Dd,
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& erectis perpendiculis
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DE, de
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circumferentiæ oc
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currentibus in
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E
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&
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e,
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erunt hæc ut velocitates quas corpus in va
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cuo, deſcendendo a puncto
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B,
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acquireret in locis
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D
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&
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d.
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Patet
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hoc per Prop. </
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<
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>LII. Lib. </
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<
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>1. Exponantur itaque hæ velocitates per
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perpendicula illa
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DE, de
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; ſitque
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DF
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velocitas quam acquirit
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in
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D
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cadendo de
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B
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in Medio reſiſtente. </
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<
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C
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& inter
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vallo
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CF
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deſcribatur Circulus
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FfM
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occurrens rectis
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de
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&
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AB
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in
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f
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&
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M,
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erit
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M
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locus ad quem deinceps abſque ulteriore reſiſten
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tia aſcenderet, &
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df
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velocitas quam acquireret in
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d.
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Unde etiam
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ſi
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Fg
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deſignet velocitatis momentum quod corpus
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D,
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deſcribendo
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ſpatium quam minimum
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Dd,
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ex reſiſtentia Medii amittit; & ſu
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matur
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CN
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æqualis
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Cg:
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erit
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N
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locus ad quem corpus deinceps
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abſque ulteriore reſiſtentia aſcenderet, &
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MN
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erit decrementum
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aſcenſus ex velocitatis illius amiſſione oriundum. </
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<
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df
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demitta
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tur perpendiculum
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Fm,
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& velocitatis
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DF
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decrementum
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Fg
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a
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reſiſtentia
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DK
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genitum, erit ad velocitatis ejuſdem incrementum
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fm
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a vi
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CD
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genitum, ut vis generans
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DK
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ad vim generantem
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CD.
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Sed & ob ſimilia
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triangula
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Fmf, Fhg,
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FDC,
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eſt
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fm
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ad
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Fm
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ſeu
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Dd,
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ut
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CD
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ad
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DF
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; & ex æquo
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Fg
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ad
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Dd
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ut
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DK
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ad
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DF.
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Item
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Fh
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ad
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Fg
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ut
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DF
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ad
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CF
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; & ex æquo
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perturbate,
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Fh
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ſeu
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MN
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ad
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Dd
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ut
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DK
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ad
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CF
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ſeu
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CM
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; ideoque ſumma omnium
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MNXCM
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æqualis erit ſummæ
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omnium
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DdXDK.
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Ad punctum mobile
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M
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erigi ſemper intelli
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gatur ordinata rectangula æqualis indeterminatæ
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CM,
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quæ motu
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continuo ducatur in totam longitudinem
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Aa
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; & trapezium ex illo
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motu deſcriptum ſive huic æquale rectangulum
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Aa
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X1/2
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aB
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æquabitur
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ſummæ omnium
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MNXCM,
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adeoque ſummæ omnium
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DdXDK,
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id eſt, areæ
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BKkVTa. </
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<
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LIBER
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SECUNDUS</
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Corol.
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Hinc ex lege reſiſtentiæ & arcuum
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Ca, CB
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differentia
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Aa,
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colligi poteſt proportio reſiſtentiæ ad gravitatem quam proxime. </
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