Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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reſiſtentiæ. Centro C& intervallo CAvel CBconſtruatur Semi­
circulus
BEeA.Deſcribat autem corpus tempore quam minimo
ſpatium
Dd,& erectis perpendiculis DE, decircumferentiæ oc­
currentibus
in E& e,erunt hæc ut velocitates quas corpus in va­
cuo
, deſcendendo a puncto B,acquireret in locis D& d.Patet
hoc
per Prop.
LII. Lib. 1. Exponantur itaque velocitates per
perpendicula
illa DE, de; ſitque DFvelocitas quam acquirit
in
Dcadendo de Bin Medio reſiſtente. Et ſi centro C& inter­
vallo
CFdeſcribatur Circulus FfMoccurrens rectis de& ABin
f& M,erit Mlocus ad quem deinceps abſque ulteriore reſiſten­
tia
aſcenderet, & dfvelocitas quam acquireret in d.Unde etiam
ſi
Fgdeſignet velocitatis momentum quod corpus D,deſcribendo
ſpatium
quam minimum Dd,ex reſiſtentia Medii amittit; & ſu­
matur
CNæqualis Cg:erit Nlocus ad quem corpus deinceps
abſque
ulteriore reſiſtentia aſcenderet, & MNerit decrementum
aſcenſus
ex velocitatis illius amiſſione oriundum.
Ad dfdemitta­
tur
perpendiculum Fm,& velocitatis DFdecrementum Fga
reſiſtentia
DKgenitum, erit ad velocitatis ejuſdem incrementum
fma vi CDgenitum, ut vis generans DKad vim generantem
CD.Sed & ob ſimilia
179[Figure 179]
triangula
Fmf, Fhg,
FDC
,eſt fmad Fm
ſeu
Dd,ut CDad
DF; & ex æquo Fgad
Ddut DKad DF.
Item
Fhad Fgut DF
ad
CF; & ex æquo
perturbate
, Fhſeu MN
ad
Ddut DKad CF
ſeu
CM; ideoque ſumma omnium MNXCMæqualis erit ſummæ
omnium
DdXDK.Ad punctum mobile Merigi ſemper intelli­
gatur
ordinata rectangula æqualis indeterminatæ CM,quæ motu
continuo
ducatur in totam longitudinem Aa; & trapezium ex illo
motu
deſcriptum ſive huic æquale rectangulum AaX1/2aBæquabitur
ſummæ
omnium MNXCM,adeoque ſummæ omnium DdXDK,
id
eſt, areæ BKkVTa. Q.E.D.

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