Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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LIBER
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PRIMUS.</
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SECTIO VI.
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De Inventione Motuum in Orbibus datis.
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PROPOSITIO XXX. PROBLEMA XXII.
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Corporis in data Trajectoria Parabolica moti invenire locum ad
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tempus aſſignatum.
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<
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S
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umbilicus &
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A
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vertex principa
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lis Parabolæ, ſitque 4
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ASXM
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æquale
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areæ Parabolicæ abſcindendæ
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APS,
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quæ radio
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SP,
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vel poſt exceſſum cor
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poris de vertice deſcripta fuit, vel an
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te appulſum ejus ad verticem deſcri
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benda eſt. </
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<
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lius abſcindendæ ex tempore ipſi pro
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portionali. </
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<
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>Biſeca
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AS
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in
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G,
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erigeque
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perpendiculum
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GH
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æquale 3 M, &
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Circulus centro
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H,
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intervallo
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HS
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deſcriptus ſecabit Parabolam in loco
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quæſito
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P.
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Nam, demiſſa ad axem
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perpendiculari
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PO
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& ducta
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PH,
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eſt
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AGq+GHq (=HP q=—AO-AG: quad.+—PO-GH: quad.)=
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AOq+POq-2
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GAO-2GHXPO+AGq+GHq.
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Unde
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2
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GHXPO (=AOq+POq-2GAO)=AOq+1/4
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POq.
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Pro
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AOq
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ſcribe (
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AOXPOq/4AS
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); &, applicatis terminis omnibus ad
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3
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PO
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ductiſQ.E.I. 2
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AS,
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fiet 4/3
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GHXAS(=1/6AOXPO+1/2 ASXPO
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=(AO+3AS/6)XPO=(4AO-3SO/6)XPO
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=areæ —
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APO-SPO)
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=areæ
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APS.
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Sed
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GH
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erat 3 M, & inde 4/3
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GHXAS
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eſt 4
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AS
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XM. </
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Ergo area abſciſſa
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APS
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æqualis eſt abſcindendæ 4
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ASXM. Q.E.D.
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Corol.
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1. Hinc
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GH
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eſt ad
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AS,
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ut tempus quo corpùs deſcrip
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ſit arcum
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AP
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ad tempus quo corpus deſcripſit arcum inter verti
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cem
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A
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& perpendiculum ad axem ab umbilico
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S
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erectum. </
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Corol.
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2. Et Circulo
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ASP
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per corpus motum
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P
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perpetuo tranſ
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eunte, velocitas puncti
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H
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eſt ad velocitatem quam corpus habuit </
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