Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſubſtantia corporea AB minor ea quæ continetur in
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AC, ergò impetus F minor eſt quàm E; quaproptèr
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lignum A intrà mercurium C
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ſursùm
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dere</
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debet tardiori, & minori velocitate, quàm ſit
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velocitas E, quæ
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ligno aſcendenti in aqua B. </
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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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De vi per
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cuſſionis pro
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poſit. </
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<
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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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<
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id
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">Et profectò euidentiſſimum eſt, quòd quodlibet
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corpus à principio intrinſeco motu ſpontaneo trans
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latum, multò faciliùs gradietur excurretque per me
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dium fluidum rarius, & cedens, quàm in medio flui
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do tenaciori, & craſſiori, vt pila aurea celeriùs per
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aerem, quàm per aquam eiuſdem ſpatij deſcendit, &
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per aquam velociori motu, quàm per mercurium ex
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currit; ſic paritèr videmus animalia, quæ intrinſecą
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vi mouentur, difficiliùs gradi poſſe, ſi infra arenam̨
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ſub mergantur, & minùs difficilè infrà lutum, & fa
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ciliùs in aqua, & multò faciliùs in aere, nec
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abbr
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vnquã
">vnquam</
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contrarium contingere poterit, quòd nimirùm idem
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animal eamdem vim motiuam exercendo difficiliùs
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& tardiùs moueatur per aerem, quàm per aquam, &
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difficiliùs per aquam, quàm per lutum, aut per hy
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drargyrum. </
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PROP. XLIII.
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Non moueri ſursùm corpora, quæ leuia appellantur, à vi
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intrinſeca leuitatis.
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<
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">HIs poſitis conſideremus modò ceram, aut veſi
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cam aere plenam
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per diuerſa me
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dia fluida, ſi
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eſt, quòd aerea veſica ſursùm
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