Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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type
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s
id
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s.000367
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pagenum
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78
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xlink:href
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010/01/086.jpg
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<
lb
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aquæ deſcendentis, nam perſeuerante vertigine, ſci
<
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licèt translato centro grauitatis vltrà medium in O
<
lb
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ſemper ſemianulus EFG grauior eſſet, quàm GKE,
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& propterea ille ſemper deſcenderet, hìc verò ſem
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per aſcenderet, proindeque anulus excurreret mo
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tu perpetuo progreſſiuo, quod eſt falſum. </
s
>
<
s
id
="
s.000368
">perſiſtit
<
lb
/>
ergo centrum grauitatis ſemper in centro N anuli,
<
lb
/>
ſiue aqua in eo contenta quieſcat, ſiuè circumduca
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/>
tur, nam ob continguitatem partium aquæ non poteſt
<
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moueri vna pars aquæ F v. g. quin vniuerſa aquą
<
lb
/>
EKG æquali velocitate reuoluatur, proindeque
<
expan
abbr
="
nõ
">non</
expan
>
<
lb
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vnica pars tantùm, ſed aqua tota
<
expan
abbr
="
impulsũ
">impulsum</
expan
>
, & impe
<
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tum acquirit, non ſecùs ac rota lignea tota ſimul ic
<
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tum recipit atque circa
<
expan
abbr
="
cẽtrum
">centrum</
expan
>
grauitatis eius æqui
<
lb
/>
libratur, pari modo aqua contenta in vaſe AC ante
<
lb
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præmiſſæ figuræ, licèt ſit fluida, habet tamen pun
<
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/>
ctum M circa quod partes habent æqualia momenta,
<
lb
/>
perinde ergo ſe habent ac ſi vniuerſa aqua in prædi
<
lb
/>
cto vaſe contenta dura eſſet, & conſiſtens vt rota li
<
lb
/>
gnea, vel intra fiſtulam anularem EFKG contentą
<
lb
/>
eſſet in qua reuoluta, ſiue quieſcente rota, aut aqua
<
lb
/>
ſemper centrum grauitatis eius in eodem ſitu perſe
<
lb
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uerare debet, & proinde libra HL quieſcet in
<
expan
abbr
="
eodẽ
">eodem</
expan
>
<
lb
/>
ſitu horizontali. </
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>
<
s
id
="
s.000369
">Igitur dubitandum non eſt aquam̨
<
lb
/>
in ſuo toto collocatam, grauitatem exercere, ſiuè illa
<
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/>
omninò ibidem quieſcat, ſiuè quomodolibet agite
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tur, & circumuoluatur. </
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>
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