Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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decrementum eſt ipſius
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GD,
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erit reciproce ut
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ED,
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adeoQ.E.D.
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recte ut
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CD,
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hoc eſt, ut ſumma ejuſdom
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GD
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& longitudinis datæ
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CG.
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Sed velocitatis decrementum, tempore ſibi reciproce pro
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portionali, quo data ſpatii particula
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D de E
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deſcribitur, eſt ut re
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ſiſtentia & tempus conjunctim, id eſt, directe ut ſumma duarum
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quantitatum, quarum una eſt ut velocitas, altera ut velocitatis qua
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dratum, & inverſe ut velocitas; adeoQ.E.D.recte ut ſumma duarum
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quantitatum, quarum una datur, altera eſt ut velocitas. </
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<
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>Igitur de
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crementum tam velocitatis quam lineæ
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GD,
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eſt ut quantitas data
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& quantitas decreſcens conjunctim, & propter analoga decremen
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ta, analogæ ſemper crunt quantitates decreſcentes: nimirum veloci
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tas & linea
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G.D. Q.E.D.
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LIBER
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SECUNDUS.</
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Corol.
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1. Igitur ſi velocitas exponatur per longitudinem
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GD,
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ſpa
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tium deſcriptum erit ut area Hyperbolica
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DESR.
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Corol.
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2. Et ſi utcunque aſſumatur punctum
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R,
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invenietur pun
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ctum
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G,
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capiendo
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GR
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ad
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GD,
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ut eſt velocitas ſub initio ad ve
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locitatem poſt ſpatium quodvis
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RSED
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deſcriptum. </
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<
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tem puncto
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G,
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datur ſpatium ex data velocitate, & contra. </
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Corol.
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3. Unde cum, per Prop. </
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>XI. detur velocitas ex dato tem
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pore, & per hanc Propoſitionem detur ſpatium ex data velocitate;
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dabitur ſpatium ex dato tempore: & contra. </
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PROPOSITIO XIII. THEOREMA X.
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Poſito quod Corpus ab uniformi gravitate deorſum attractum recta:
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aſcendit vel deſcendit, & quod eidem reſiſtitur partim in ra
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tione velocitatis, partim in ejuſdem ratione duplicata: dico quod
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ſi Circuli & Hyperbolæ diametris parallelæ rectæ per conjuga
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tarum diametrorum terminos ducantur, & velocitates ſint ut
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ſegmenta quædam parallelarum a dato puncto ducta, Tempora
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erunt ut arearum Sectores, rectis a centro ad ſegmentorum ter
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minos ductis abſciſſi: & contra.
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Caſ.
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1. Ponamus primo quod corpus aſcendit, centroque
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D
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&
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ſemidiametro quovis
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DB
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deſcribatur Circuli quadrans
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BETF,
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&
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per ſemidiametri
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DB
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terminum
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B
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agatur infinita
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BAP,
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ſemidia
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metro
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DF
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parallela. </
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<
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>In ea detur punctum
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A,
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& capiatur ſegmen
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tum
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AP
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velocitati proportionale. </
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<
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>Et cum reſiſtentiæ pars aliqua ſit </
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