Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Quæſt. 19.</
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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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">Sed inſtat aduerſarius quomodo poteſt grauitas
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efficere impetum quo pila aſcendit ſi videmus
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motũ
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prædictum aſcenſus ſenſim debilitari, & tandem ex
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tingui ſolummodo propter renitentiam, & contra
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riam actionem, quam efficit pondus eiuſdem pilæ?
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<
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">Et hìc aio, quòd exercitium eiuſdem ponderis, ſcili
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cèt compreſſio eius producit duos effectus contra
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rios, primò per deſcenſum creat, fouet, & auget im
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petum eius, poſteà per aſcenſum ei contranititur,
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debilitat, atque deſtruit eum, & licèt hoc mirabilę
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videatur, nihilominùs idipſum concedant neceſsè
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eſt, velint, nolint, cùm ſenſu conſtet, ſic eadem manus
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impellendo ſaxum dum deorsùm decidit, auget mul
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tiplicatque eius impetum, at ſi ſaxum ſursùm aſcen
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deret eadem manus contrario motu impetum eius
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debilitaret, atque deſtrueret. </
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id
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">ſimilitèr idem calor
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Solis generat, & auget plantas, & poſtea eas exic
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cat extinguitque. </
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ſuperiùs adducti ratiocinij. </
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PROP. XLI.
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Ab eodem principio grauitatis aſcenſio, & ſubleuatio cor
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porum leuium effici poteſt.
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<
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">SEd redeo iam ad propoſitum, & alia ratione
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dem</
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propoſitionem perſuadere conabor. </
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gatiſſimum axioma omnium
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eſt, quòd
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natura ſemper producit ſuas operationes via breuiſ
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ſima, ſummo compendio, atque abhorret à prolixi-
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