Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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tervallo
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AD
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deſcribitur, trahunt corpus
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P
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verſus
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A,
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eſt ut area
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tota
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AHIKL
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ducta in
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AP.
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E. D.
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LIBER
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PRIMUS.</
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Corol.
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1. Hinc ſi vires punctorum decreſcunt in duplicata di
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ſtantiarum ratione, hoc eſt, ſi ſit
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FK
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ut (1/
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PFquad.
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), atque adeo a
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rea
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AHIKL
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ut (1/
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PA
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-1/
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PH
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); erit attractio corpuſculi
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P
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in Circu
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lum ut (1-
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PA/PH
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), id eſt, ut (
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AH/PH
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). </
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Corol.
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2. Et univerſaliter, ſi vires punctorum ad diſtantias D ſint
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reciproce ut diſtantiarum dignitas quælibet D
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n
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, hoc eſt, ſi ſit
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FK
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ut (1/D
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n
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), adeoque area
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AHIKL
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ut (1/
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PA
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n-1
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-1/
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PH
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n-1
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); erit attra
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ctio corpuſculi
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P
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in Circulum ut (1/
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PA
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n-2
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-
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PA/PH
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n-1
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). </
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Corol
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3. Et ſi diameter Circuli augeatur in infinitum, & nume
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rus
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n
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ſit unitate major; attractio corpuſculi
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P
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in planum totum
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infinitum erit reciproce ut
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PA
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,
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propterea quod terminus al
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ter (
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PA/PH
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n-1
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) evaneſcet. </
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PROPOSITIO XCI. PROBLEMA XLV.
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Invenire attractionem corpuſculi ſiti in axe Solidi rotundi, ad cujus
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puncta ſingula tendunt vires æquales centripetæ in quacunque
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diſtantiarum ratione decreſcentes.
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<
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>In Solidum
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ADEFG
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tra
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hatur corpuſculum
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P,
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ſitum in
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ejus axe
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AB.
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Circulo quoli
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bet
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RFS
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ad hunc axem per
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pendiculari ſecetur hoc Solidum,
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& in ejus diametro
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FS,
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in pla
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no aliquo
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PALKB
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per axem
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tranſeunte, capiatur (per Prop. </
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XC) longitudo
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FK
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vi qua cor
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puſculum
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P
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in circulum illum
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attrahitur proportionalis. </
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<
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K
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curvam line
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am
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LKI,
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planis extimorum circulorum
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AL
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&
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BI
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occurrentem in
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L
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&
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I
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; & erit attractio corpuſculi
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P
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in Solidum ut area
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LABI.
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E. I.
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