Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1etiam ſecet communem illam diametrum AB(ſi opus eſt productam)
in T; ſitque SYad hanc rectam, & BQad
82[Figure 82]
hanc diametrum perpendicularis, atque Figu­
RPBlatus rectum ponatur L. Conſtat
per Cor.
9. Prop. XVI, quod corporis in
linea RPBcirca centrum Smoventis velo­
citas in loco quovis Pſit ad velocitatem cor­
poris intervallo SPcirca idem centrum Cir­
culum deſcribentis in ſubduplicata ratione rec­
tanguli 1/2 LXSPad SYquadratum. Eſt au­
tem ex Conicis ACBad CPqut 2 AOad L,
adeoque (2CPqXAO/ACB) æquale L. Ergo ve­
locitates illæ ſunt ad invicem in ſubduplicata
ratione (CPqXAOXSP/ACB) ad SY quad.Por­
ro ex Conicis eſt COad BOut BOad TO,
& compoſite vel diviſim ut CBad BT.
Unde vel dividendo vel componendo fit
BO-vel+COad BOut CTad BT,id eſt
ACad AOut CPad BQ; indeque (CPqXAOXSP/ACB) æquale eſt
(BQqXACXSP/AOXBC.) Minuatur jam in infinitum Figuræ RPBlatitu­
do CP,ſic ut punctum Pcoeat cum puncto C,punctumque Scum
puncto B,& linea SPcum linea BC,lineaque SYcum linea BQ;
& corporis jam recta deſcendentis in linea CBvelocitas fiet ad
velocitatem corporis centro Bintervallo BCCirculum deſcribentis,
in ſubduplicata ratione ipſius (BQqXACXSP/AOXBC) ad SYq,hoc eſt (neg­
lectis æqualitatis rationibus SPad BC& BQqad SYq) in ſub­
duplicata ratione ACad AOſive 1/2 AB. que E. D.
LIBER
PRIMUS.
Corol.1. Punctis B& Scoeuntibus, fit TCad TSut AC
ad AO.
Corol.2. Corpus ad datam a centro diſtantiam in Circulo quo­
vis revolvens, motu ſuo ſurſum verſo aſcendet ad duplam ſuam a
centro diſtantiam.

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