Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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N1137F
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<
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N13D76
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<
s
id
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N13D99
">
<
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pagenum
="
44
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xlink:href
="
026/01/076.jpg
"/>
eſt centrum grauitatis, vt patet; </
s
>
<
s
id
="
N13DA2
">vt autem habeatur centrum impreſſio
<
lb
/>
nis; </
s
>
<
s
id
="
N13DA8
">aſſumatur AN media proportionalis inter totam AD, & ſubdu
<
lb
/>
plum AC; </
s
>
<
s
id
="
N13DAE
">certè cum triangulum ANO ſit ſubduplum totius ADE,
<
lb
/>
vt conſtat ex Geometria, & æquale trapezo ND EO; </
s
>
<
s
id
="
N13DB4
">erit impetus in
<
lb
/>
vtroque æqualis; </
s
>
<
s
id
="
N13DBA
">igitur in N erit centrum impreſſionis, vel impetus; </
s
>
<
s
id
="
N13DBE
">vt
<
lb
/>
autem habeatur centrum percuſſionis; </
s
>
<
s
id
="
N13DC4
">in quo ſcilicet maximus ictus in
<
lb
/>
fligitur, inueniatur centrum grauitatis H, ducaturque KHI parallela
<
lb
/>
DE, centrum percuſſionis erit in I; </
s
>
<
s
id
="
N13DCC
">quippe in I totus impeditur impetus
<
lb
/>
grauitatis vtrimque, cum ſit in æquilibrio; </
s
>
<
s
id
="
N13DD2
">quomodo verò inueniatur
<
lb
/>
punctum H facilè habetur ex Archimede, ductis ſcilicet AF, DB, quæ
<
lb
/>
diuidant bifariam æqualiter DE, EA; vel aſſumpta AI dupla ID, quod
<
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/>
demonſtrabimus in Mechan. </
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>
</
p
>
<
p
id
="
N13DDD
"
type
="
main
">
<
s
id
="
N13DDF
">
<
emph
type
="
center
"/>
<
emph
type
="
italics
"/>
Theorema
<
emph.end
type
="
italics
"/>
37.
<
emph.end
type
="
center
"/>
</
s
>
</
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id
="
N13DEB
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type
="
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">
<
s
id
="
N13DED
">
<
emph
type
="
italics
"/>
Si circa centrum immobile rotetur corpus parallelipedum
<
emph.end
type
="
italics
"/>
CA,
<
emph
type
="
italics
"/>
diuerſa eſt
<
lb
/>
ratio percuſſionum ab ea, quàm ſuprà propoſuimus
<
emph.end
type
="
italics
"/>
; </
s
>
<
s
id
="
N13DFE
">moueatur enim circa
<
lb
/>
centrum C, fitque CA diuiſa bifariam in B, haud dubiè punctum A
<
lb
/>
faciet arcum AE eo tempore, quò punctum B faciet BD ſubduplum
<
lb
/>
AE; </
s
>
<
s
id
="
N13E08
">igitur punctum A duplò velociùs mouetur quàm B, vt conſtat; </
s
>
<
s
id
="
N13E0C
">igi
<
lb
/>
tur habet duplò maiorem impetum; cum effectum habeat duplò maio
<
lb
/>
rem per Ax. 13. n. </
s
>
<
s
id
="
N13E14
">4. igitur cum totus motus ſegmenti AB ſit ad to
<
lb
/>
tum motum ſegmenti BC, vt ſpatia acquiſita; </
s
>
<
s
id
="
N13E1A
">certè ſpatia acquiſita
<
lb
/>
ſunt vt arcus; </
s
>
<
s
id
="
N13E20
">igitur & trapezus BAED, continet 3/4 totius CAE, vt
<
lb
/>
conſtat; </
s
>
<
s
id
="
N13E26
">ſunt enim ſectores ſimilis in ratione duplicata radiorum; </
s
>
<
s
id
="
N13E2A
">igi
<
lb
/>
tur totus motus ſegmenti BC ſubquadruplus motus totius CA; igitur
<
lb
/>
& impetus; </
s
>
<
s
id
="
N13E32
">vt autem habeatur centrum impreſſionis, vel impetus; </
s
>
<
s
id
="
N13E36
">ſit ſe
<
lb
/>
ctor CHI, ſubduplus totius CAE quod quomodo fiat, patet ex Geo
<
lb
/>
metria; </
s
>
<
s
id
="
N13E3E
">accipiatur tantùm ſubdupla diagonalis quadrati lateris CA, igi
<
lb
/>
tur in puncto H eſt centrum impreſſionis, ſeu media proportionalis in
<
lb
/>
ter totam CA, & ſubduplam CB: </
s
>
<
s
id
="
N13E46
">vt autem habeatur percuſſionis, aſ
<
lb
/>
ſumatur CY dupla YA; </
s
>
<
s
id
="
N13E4C
">Dico punctum Y eſſe centrum percuſſionis;
<
lb
/>
quia perinde ſe habet, atque ſi eſſet trianguli cadentis ictus, vt demon
<
lb
/>
ſtrabimus aliàs nunc tantùm indicaſſe ſufficiat. </
s
>
</
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>
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p
id
="
N13E54
"
type
="
main
">
<
s
id
="
N13E56
">
<
emph
type
="
center
"/>
<
emph
type
="
italics
"/>
Corollarium
<
emph.end
type
="
italics
"/>
1.
<
emph.end
type
="
center
"/>
</
s
>
</
p
>
<
p
id
="
N13E63
"
type
="
main
">
<
s
id
="
N13E65
">Hinc etiam ſoluetur, quod proponunt aliqui; ſeu potiùs quærunt; </
s
>
<
s
id
="
N13E69
">
<
lb
/>
in quà ſcilicet parte maiorem ictum infligat enſis; </
s
>
<
s
id
="
N13E6E
">ſi enim ſit eiuſdem
<
lb
/>
craſſitiei in omnibus ſuis partibus, idem dicendum eſt quod de cylin
<
lb
/>
dro CA; ſi verò in mucronem deſinat, inueniemus etiam centrum
<
lb
/>
percuſſionis. </
s
>
</
p
>
<
p
id
="
N13E78
"
type
="
main
">
<
s
id
="
N13E7A
">
<
emph
type
="
center
"/>
<
emph
type
="
italics
"/>
Corollarium
<
emph.end
type
="
italics
"/>
2.
<
emph.end
type
="
center
"/>
</
s
>
</
p
>
<
p
id
="
N13E87
"
type
="
main
">
<
s
id
="
N13E89
">Huc etiam reuoca clauarum ictus, vel aliorum corporum, quæ ad in
<
lb
/>
ſtar ſeu conorum, ſeu pyramidum verſus mucronem maiora ſunt, vel
<
lb
/>
denſiora; quippe ex iacto ſuprà principio iſtorum omnium effectuum
<
lb
/>
rationes demonſtrabimus. </
s
>
</
p
>
</
chap
>
</
body
>
</
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>
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archimedes
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