Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
LIBER
PRIMUS.
SECTIO VII.
De Corporum Aſcenſu & Deſcenſu Rectilineo.
PROPOSITIO XXXII. PROBLEMA XXIV.
Poſito quod Vis centripeta ſit reciproce proportionalis quadrato di­
ſtantiæ loeorum a centro, Spatia definire quæ corpus recta cadendo
datis temporibus deſcribit.
Cas.1. Si Corpus non cadit perpendicu­
80[Figure 80]
lariter deſcribet id, per Corol.
1. Prop. XIII,
Sectionem aliquam Conicam cujus umbili­
cus congruit cum centro virium.
Sit Sec­
tio illa Conica ARPB& umbilicus ejus S.
Et primo ſi Figura Ellipſis eſt, ſuper hu­
jus axe majore ABdeſcribatur Semicirculus
ADB,& per corpus decidens tranſeat rec­
ta DPCperpendicularis ad axem; actiſque
DS, PSerit area ASDareæ ASPat­
que adeo etiam tempori proportionalis.
Ma­
nente axe ABminuatur perpetuo latitudo
Ellipſeos, & ſemper manebit area ASD
tempori proportionalis.
Minuatur latitudo
illa in infinitum: &, Orbe APBjam coin­
cidente cum axe AB& umbilico Scum
axis termino B,deſcendet corpus in recta
AC,& area ABDevadet tempori pro­
portionalis.
Dabitur itaque Spatium AC,
quod corpus de loco Aperpendiculariter
cadendo tempore dato deſcribit, ſi modo tempori proportiona­
lis capiatur area ABD,& a puncto Dad rectam ABdemit­
tatur perpendicularis DC. que E. I.

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