Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1in caſu hujus Corollarii, ſit DS+DHad DHut 4 DSad L,&
diviſim DSad DHut 4 DS-Lad L.
DE MOTU
CORPORUM
Corol.2. Unde ſi datur corporis velocitas in vertice principali D,
invenietur Orbita expedite, capiendo ſcilicet latus rectum ejus, ad
duplam diſtantiam DS,in duplicata ratione velocitatis hujus datæ
ad velocitatem corporis in Circulo, ad diſtantiam DS,gyrantis (per
Corol.
3. Prop. XVI.) dein DHad DSut latus rectum ad differen­
tiam inter latus rectum & 4 DS.
Corol.3. Hinc etiam ſi corpus moveatur in Sectione quacunque
Conica, & ex Orbe ſuo impulſu quocunque exturbetur; cognoſci
poteſt Orbis in quo poſtea curſum ſuum peraget.
Nam componen­
do proprium corporis motum cum motu illo quem impulſus ſolus
generaret, habebitur motus quocum corpus de dato impulſus loco,
ſecundum rectam poſitione datam, exibit.
Corol.4. Et ſi corpus illud vi aliqua extrinſecus impreſſa conti­
nuo perturbetur, innoteſcet curſus quam proxime, colligendo mu­
tationes quas vis illa in punctis quibuſdam inducit, & ex ſeriei ana­
logia mutationes continuas in locis intermediis æſtimando.
Scholium.
Si corpus Pvi centripeta ad
27[Figure 27]
punctum quodcunQ.E.D.tum R
tendente moveatur in perimetro
datæ cujuſcunque Sectionis co­
nicæ cujus centrum ſit C,& re­
quiratur Lex vis centripetæ: du­
catur CGradio RPparalle­
la, & Orbis tangenti PGoc­
currens in G; & vis illa (per
Corol.
1 & Schol. Prop. X, & Corol. 3 Prop. VII.) erit ut
(CG cub./RP quad.)

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