Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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89
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026/01/121.jpg
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<
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<
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Theorema
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44.
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<
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<
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Hinc peteſt dici creſcere velocitatem quolibet inſtanti iuxta rationem ſpatij
<
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quod illo inſtanti decurritur
<
emph.end
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; </
s
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<
s
id
="
N16914
">quod certè verum eſt, dum intelligatur legi
<
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timus horum verborum ſenſus; </
s
>
<
s
id
="
N1691A
">quidquid reclamet Saluiatus apud
<
lb
/>
Galil. dialogo 3. modò aſſumatur progreſſio incrementi in ſingulis in
<
lb
/>
ſtantibus, in quibus reuerà fit; cur enim potiùs in vno quàm in alio? </
s
>
<
s
id
="
N16924
">
<
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quippe ſi comparetur velocitas vnius inſtantis cum velocitate alterius; </
s
>
<
s
id
="
N16929
">
<
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haud dubiè erit eadem vtriuſque ratio, quæ ſpatiorum; </
s
>
<
s
id
="
N1692E
">ſi enim vno in
<
lb
/>
ſtanti percurritur vnum ſpatium cum vno velocitatis gradu; </
s
>
<
s
id
="
N16934
">certè in
<
lb
/>
ſtanti æquali acquiritur duplum ſpatium cum duobus velocitatis gradi
<
lb
/>
bus, nec obeſt, quod obiicit Galileus tunc motus eſſe æquabiles; </
s
>
<
s
id
="
N1693C
">quia
<
lb
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motus qui fit in inſtanti debet conſiderari vt æquabilis; </
s
>
<
s
id
="
N16942
">appello enim
<
lb
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inſtans totum illud tempus, quo ſimul acquiritur aliquid impetus, ali
<
lb
/>
quid enim ſimul acquiri neceſſe eſt; </
s
>
<
s
id
="
N1694A
">nec demum obſtat quod dicit, dari
<
lb
/>
non poſſe motum inſtantaneum, quod multi haud dubiè negabunt; </
s
>
<
s
id
="
N16950
">ego
<
lb
/>
in Metaphyſica explicabo quonam pacto dari poſſit motus inſtanta
<
lb
/>
neus, qui reuerà datur actu, non potentiâ; </
s
>
<
s
id
="
N16958
">quia quacunque duratione
<
lb
/>
data poteſt dari minor; igitur quocunque dato motu poteſt dari minor. </
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>
</
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>
<
p
id
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N1695E
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type
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">
<
s
id
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type
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<
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type
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Scholium.
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type
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type
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"/>
</
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</
p
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<
p
id
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type
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">
<
s
id
="
N1696E
">Obſeruabis primò hanc ſpatiorum rationem, quæ eſt eadem cum ra
<
lb
/>
tione velocitatum aſſumendam tantùm eſſe in iis ſpatiis, quæ acquirun
<
lb
/>
tur ſingulis inſtantibus; </
s
>
<
s
id
="
N16976
">ſi enim accipiantur partes temporis maiores, quæ
<
lb
/>
conflentur ex multis inſtantibus; </
s
>
<
s
id
="
N1697C
">haud dubiè maior erit ratio ſpatio
<
lb
/>
rum, quàm velocitatum.v.g.ſi primo inſtanti acquiratur primo ſpatium,
<
lb
/>
ſecundo, 2.tertio, 3.quarto 4.igitur ſi
<
expan
abbr
="
cõparetur
">comparetur</
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>
velocitas primi inſtantis
<
lb
/>
cum velocitate quarti æqualis erit, vt ratio ſpatiorum, id eſt, vt 1. ad 4.
<
lb
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At verò ſi accipiatur pars temporis conſtans duobus inſtantibus, hæc 4.
<
lb
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inſtantia conflabunt tantùm 2. partes temporis æquales; </
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>
<
s
id
="
N1698E
">in prima ac
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lb
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quirentur 3.ſpatia, in ſecunda 7.vt patet: </
s
>
<
s
id
="
N16994
">ſed quia velocitas primæ par
<
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tis temporis non eſt æquabilis, nec etiam velocitas ſecundæ; </
s
>
<
s
id
="
N1699A
">addantur
<
lb
/>
velocitates primi & ſecundi inſtantis, itemque ſeorſim velocitates tertij,
<
lb
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& quarti; </
s
>
<
s
id
="
N169A2
">certè ratio collectorum erit vt ratio ſpatiorum; ſi enim velo
<
lb
/>
citas ſecundi inſtantis comparetur cum velocitate quarti eſt tantùm
<
lb
/>
1/2 cum tamen primum ſpatium ſit ad ſecundum in ratione 3/7. </
s
>
</
p
>
<
p
id
="
N169AA
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type
="
main
">
<
s
id
="
N169AC
">Secundò, ſi comparentur ſpatia cum temporibus eſt alia ratio v.g.ſpa
<
lb
/>
tium acquiſitum vno inſtanti ſe habet ad ſpatium acquiſitum in duobus
<
lb
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inſtantibus, vt 1, ad 3.in tribus vt 1.ad 6.in 4. vt 1. ad 10. </
s
>
</
p
>
<
p
id
="
N169B3
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type
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main
">
<
s
id
="
N169B5
">Tertiò obſeruabis, non poſſe ſenſu percipi inſtans, imò neque tempo
<
lb
/>
ris partem ex mille inſtantibus conflatam; </
s
>
<
s
id
="
N169BB
">nec etiam ſpatium quod ac
<
lb
/>
quiritur primo inſtanti; </
s
>
<
s
id
="
N169C1
">adhibenda ſunt tamen inſtantia neceſſariò ad
<
lb
/>
explicandam proportionem huius accelerationis, quæ fit in ſingulis in
<
lb
/>
ſtantibus; vt verò rem iſtam reuocemus ad ſenſibilem praxim, aſſume
<
lb
/>
mus proportionem aliam ſenſibilem, quæ proximè ad veram accedit, nec
<
lb
/>
ferè ſenſibiliter fallere poteſt, de qua infrà. </
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>
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