Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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cap. 2. prop. 4.
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& 11.</
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Cap. 11. gra
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uia in fluido
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velocitati
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bus inæqua
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libus ferri
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debere.</
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eſt de æquilibrio, & de vi motiua qua
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corpus in aqua aſcendit, vel deſcendit, non verò de
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celeritate motus eius, non enim motus eius retarda
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tur omninò, ſed ſolummodò non augetur eodem pro
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greſſu quo dum infra aquam poſitum ferebatur. </
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hoc pendet ab impetu acquiſito in præcedenti motu,
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qui impetus perſeuerans ex ſui natura ſuum effectum
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velocitatis producit, licet cauſa impulſiua non per
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ſeueret eiuſdem gradus, ſed continentèr debilitetur;
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& hæc eſt ratio quare lignum aſcendens non quieſcit
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præcisè in eo ſitu in quo æquilibratur cum aqua col
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laterali, ſed altiùs ab impetu præconcepto impelli
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tur, & indè deorsùm decidendo repetitis aliquibus
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vibrationibus, tandem in ſitu æquilibrij quieſcit. </
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Archimedea, quæ habet quod tanta vi leue corpus
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infra
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fluidum demerſum ſursùm
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,
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tum</
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eſt pondus, quo fluidum æquale ipſi ſolido idip
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ſum ſuperat. </
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atque celeritate qua lignum ex. </
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">gr. ſursùm aſcendit,
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ſed de energia, qua lignum in ſtatu quietis ſursùm ni
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titur aſcendere, ſcilicèt ſi impediatur eius motus, vt
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in bilanci contingit, tunc quidem propoſitio verifi
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catur, non verò in actu motionis eius, nam tunc im
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petus quo ſursùm aſcendit, auctus à præcedenti mo
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tu ſuperabit quamcumque immenſam vim compreſſ
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ſiuam cuiuslibet vaſtiſſimi ponderis incumbentis, vt
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in noſtro Opere de vi percuſs. </
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Incidenter
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verus ſenſuæ
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Archimedis
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declaratur.</
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De
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hu
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mido lib. 1.
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pr. 6.</
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