Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Noua
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argu-mẽta
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menta</
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eiuſd
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eiuſdẽ
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Authoris
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pro leuitate
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poſitiua.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LXXIX.
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Lignum in aqua aſcendens ſaltu ſupra eius libellam exilit
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ob impetum acquiſitum in præcedenti motu, licèt per
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extruſionem fiat.
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<
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">PRo reſponſione ponamus cylindrum ligneum in
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fundo aquæ. </
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<
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id
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s.000832
">Dico quòd ſi id moueatur ſursùm
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ab intrinſeca vilenitatis, vel ab extruſione medij flui
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di aquei, neceſſariò velocitas eius dum aſcendit
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expan
abbr
="
cõ-tinentèr
">con
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tinentèr</
expan
>
augebitur, quia dum ſursùm
<
expan
abbr
="
aſcẽdit
">aſcendit</
expan
>
in quo
<
lb
/>
libet temporis inſtanti, eadem virtus motiua, aut le
<
lb
/>
uitatis, aut externi impulſus, quæ ſemper eadem, &
<
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eiuſdem energiæ eſt, pariterque extruſio à medio
<
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fluido paritèr efficitur ab eadem virtute impulſiua,
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quæ eſt differentia, vel exceſſus ponderis aquæ ſu
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pra pondus ligni aſcendentis, cùmque gradus velo
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citatum à ligno acquiſiti ob impulſiones ei illatas
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expan
abbr
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nõ
">non</
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>
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ſubitò extinguantur, ſed perſeuerent, vt dictum eſt,
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igitur ſubſequentes impulſiones imprimuntur ei mo
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bili non inerti, ſed iam agitati à præcedentibus im
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preſſis velocitatibus, & proindè ſucceſſiuo incre
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mento augebitur gradus impetus eiuſdem ligni
<
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abbr
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aſcẽ-dentis
">aſcen
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dentis</
expan
>
. </
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<
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id
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s.000833
">Igitur mirum non eſt, cylindrum ligneum̨,
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quando iam acquiſiuit inſignem gradum impetus à
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continuato impulſu, & preſſione aquæ circumfuſæ,
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ſiuè ab interna eius leuitate poſitiua, mirum,
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inquã
">inquam</
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,
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non eſt ſi ab aqua proſiliat, & ſursùm extra aquæ ſu
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perficiem propellatur: non igitur ſignum
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neceſſariũ
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