Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ſitione XXV conſtructa & demonſtrata ſunt, erit vis qua corpus
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olcnlans urgetur in loco quovis
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D,
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ad vim reſiſtentiæ ut arcus
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CD
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ad arcum
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CO,
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qui ſemiſſis eſt differentiæ illius
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Aa.
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Ideoque
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vis qua corpus oſcillans urgetur in Cycloidis principio ſeu puncto
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altiſſimo, id eſt, vis gravitatis, erit ad reſiſtentiam ut arcus Cy
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cloidis inter punctum illud ſupremum & punctum infimum
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C
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ad
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arcum
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CO
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; id eſt (ſi arcus duplicentur) ut Cycloidis totius arcus,
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ſeu dupla penduli longitudo, ad arcum
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Aa. </
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E. D.
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LIBER
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SECUNDUS.</
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PROPOSITIO XXIX. PROBLEMA VI.
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Poſito quod Corpori in Cycloide oſcillanti reſiſtitur in duplicata ra
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tione velocitatis: invenire reſiſtentiam in locis ſingulis.
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Ba
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(Fig. </
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>XXV) arcus oſcillatione integra deſcriptus,
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ſitque
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C
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infimum Cycloidis punctum, &
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CZ
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ſemiſſis arcus Cycloi
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dis totius, longitudini Penduli æqualis; & quæratur reſiſtentia cor
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poris in loco quovis
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D.
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Secetur recta infinita
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OQ
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in punctis
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O,
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C, P, Q,
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ea lege, ut (ſi erigantur perpendicula
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OK, CT, PI, QE,
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centroque
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O
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& Aſymptotis
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OK, OQ
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deſcribatur Hyperbola
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TIGE
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ſecans perpendicula
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CT, PI, QE
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in
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T, I
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&
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E,
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& per punctum
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I
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agatur
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KF
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parallela Aſymptoto
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OQ
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occurrens Aſymptoto
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OK
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in
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K,
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& perpendiculis
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CT
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&
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QE
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in
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L
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&
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F
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) fuerit area Hyperboliea
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PIEQ
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ad aream Hyperbolicam
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PITC
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ut arcus
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BC
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deſcenſu cor
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poris deſcriptus ad arcum
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Ca
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aſcenſu deſcriptum, & area
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IEF
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