Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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vulgaribus repugnant; immò & cunctis ferè præmiſſis Theorematis. </
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Theorema
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83.
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Motus violentus non tendit ad quietem per omnes tarditatis gradus, vt
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paſſim aſſerit Galileus
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; </
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">Primò, quia non ſunt infinita inſtantia, ſed retarda
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tur tantùm ſingulis inſtantibus; </
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<
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">Secundò in medio denſiore minùs du
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rat; </
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<
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">igitur non tranſit per tot gradus tarditatis; </
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<
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">præterea in plano incli
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nato ſurſum în minore proportione retardatur motus, quod etiam in
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plano horizontali certiſſimum eſt; quorum omnium rationes ſuo loco
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videbimus. </
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">Nec eſt quod aliqui dicant infinito tribui non poſſe hæc prædicata
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æqualitatis vel inæqualitatis, quod falſum eſt, loquamur de infinito actu; </
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ſi enim eſſet numerus infinitus hominum, nunquid verum eſſet dicere
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numerum oculorum eſſe maiorem numero hominum; </
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<
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">nec eſt quod ali
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qui confugiant ad diſiunctiones; </
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">nos rem iſtam ſuo loco fusè tractabi
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mus & demonſtrabimus, ni fallor, cum Ariſtotele, fieri non pòſſe vt ſit
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aliquod creatum infinitum actu; </
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<
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">licèt vltrò concedamus plura eſſe infi
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nita potentiâ; & verò certum eſt infinito potentiâ non ineſſe huiuſmodi
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prædicata æqualitatis, vel inæqualitatis. </
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Theorema
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84.
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Immò ſi tranſiret mobile ſursùm proiectum per omnes tarditatis gradus,
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nunquam profectò deſcenderat
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; </
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">quia cum ſingulis inſtantibus ſinguli gra
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dus reſpondeant, & duo inſtantia ſimul eſſe non poſſint; </
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<
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verum eſſet dicere fluxiſſe infinita; </
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<
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">igitur nec mobile per infinitos tar
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ditatis gradus ad quietem perueniſſe; hoc Theorema ſupponit eſſe tan
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tùm finita inſtantia. </
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Theorema
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85.
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Reſiſtentia aëris est maior initio, quàm in fine motus violenti,
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vt conſtat ex
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dictis, quia initio motus eſt velocior, igitur plures partes aëris æquali
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tempore reſiſtunt; in fine verò è contrario. </
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Theorema
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86.
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Hinc oppoſita eſt omninò ratio reſistentia, quæ ſequitur ex motu violento illi,
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quæ cum naturali eſt coniuncta,
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hæc enim initio minor, in fine maior, illa
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verò initio maior, & in fine minor; hinc prima creſcit cam ſuo motu,
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ſecunda cum ſuo decreſcit. </
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Theorema
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87.
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Decreſcit igitur impetus eadem proportione, qua decreſcit reſiſtentia
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; vt pa
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tet ex dictis; igitur in toto motu eadem eſt reſiſtentiæ proportio. </
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Theorema
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88.
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Variæ ſunt potentiæ motrices, à quibus mobile ſurſum proiici potest motu
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violento,
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v.g. potentia motrix animantium, potentia motrix grauium mo
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bili ſcilicet ſurſum repercuſſo; potentia motrix, quæ ſequitur ex com
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preſſione & rarefactione corporum, ſed de his omnibus aliàs. </
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