Newton, Isaac, Philosophia naturalis principia mathematica, 1713
page |< < of 524 > >|
1
LIBER
PRIMUS.
PROPOSITIO LIII. PROBLEMA XXXV.
Conceſſis Figurarum curvilinearum quadraturis, invenire Vires qui­
bus corpora in datis curvis lineis Oſcillationes ſemper Iſochro­
nas peragent.
Oſcilletur corpus Tin curva quavis linea STRQ,cujus axis ſit
ORtranſiens per virium centrum C.Agatur TXquæ curvam il­
lam in corporis loco quovis Tcontingat, inque hac tangente TX
101[Figure 101]
capiatur TYæqualis arcui TR.Nam longitudo arcus illius ex Fi­
gurarum quadraturis (per Methodos vulgares) innoteſcit.
De pun­
cto Yeducatur recta YZtangenti perpendicularis. Agatur CTper­
pendiculari illi occurrens in Z,& erit Vis centripeta proportiona­
lis rectæ TZ. que E. I.

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