Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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361 - 390
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451 - 480
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<
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conſtat ex dictis; igitur rationes ictuum non ſunt, vt rationes ſegmen
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torum integri ſpatij. </
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Theorema
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47.
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Vt in praxi determinentur rationes ictuum
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; </
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<
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">aſſumatur progreſſio Gali
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lei in AF, ita vt ſi prima parte temporis ſenſibili percurratur ſpatium
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FE 9 partium æqualium; </
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<
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">ſecunda percurratur ED. 7. partium, tertia
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DC 5. quarta CB 3; </
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<
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">quinta BA 1. hoc poſito facilè erit determinare
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rationes ictuum; </
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<
s
id
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">nam in deſcenſu ictus ſunt vt velocitates, & hæ vt tem
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pora; </
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<
s
id
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">igitur ſi AB percurritur in dato tempore, & AC in duobus prio
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ri æqualibus; </
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<
s
id
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">certè ictus in deſcenſu AC eſt duplus ictus in deſcenſu
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AB; in AD triplus, &c. </
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<
s
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">Igitur in aſcenſu ictus in F erit quintuplus,
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ictus in E quadruplus in D triplus, &c. </
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<
s
id
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">igitur ictus ſunt in ratione dupli
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cata ſpatiorum facto ſpatij initio à ſummo puncto A. </
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Theorema
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48.
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Hinc cognitis viribus, quibus corpus graue proijcitur ad datam altitudi
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nem, cognoſci poſſunt vires, quibus ad aliam quamcumque proijciatur
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; </
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<
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">v. g.
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proiiciatur corpus graue ad altitudinem 48. pedum; </
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<
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id
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">vires ſunt iis æqua
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les, quas acquirit in deſcenſu eiuſdem altitudinis 48. pedum; </
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<
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">ſit alia di
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ſtantia 100. pedum; haud dubiè vires neceſſariæ ad motum hunc violen
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tum ſunt æquales iis, quas acquireret in deſcenſu 100. pedum per Th.
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40. atqui ita ſe habent vires acquiſitæ in deſcenſu 48. pedum ad vires
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acquiſitas in deſcenſu 100. vt v.g. 48. ad v.g. 100. id eſt ferè vt 7.
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ad 10. </
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Theorema
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49.
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Cognitis etiam ſpatiis cognoſcetur tempus
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; </
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<
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">ſit enim decurſum idem ſpa
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tium 48. pedum motu violento ſurſum; </
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>
<
s
id
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">idque v. g. tempore 2. ſecundo
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rum, quod ferè cum experientia conſentit; </
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>
<
s
id
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">ſit aliud ſpatium 100. tempus
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primi motus eſt ad tempus ſecundi vt v. g. 48. ad v. g. 100. quia ſpatia
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ſunt vt quadrata temporum; </
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>
<
s
id
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N19CE4
">igitur tempora vt radices 4. hinc vires ſunt
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in ratione temporum; </
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<
s
id
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">quia vt temporibus æqualibus acquiruntur æqua
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lia velocitatis momenta in motu naturali, ita & deſtruuntur æqualia in
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motu violento, quæ omnia conſtant; igitur ictus ſunt vt vires, vires vt
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tempora, tempora denique, vt radices
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ſpatiorum. </
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Theorema
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150.
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In vltimo contactu motus violenti nullus eſt ictus, v. g. mobile projectum
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ſurſum
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per lineam
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FA
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nullam percuſſionem infligeret in
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A; </
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<
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quia non tendit vlteriùs; </
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>
<
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id
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">igitur non impeditur eius motus à ſuperficie
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corporis terminati ad punctum A; igitur nullum impetum in eo produ
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cit, qui tantùm producitur ad tollendum impedimentum per Th.44.l.1.
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igitur nullum ictum infligit, qui tantùm infligitur per impetum, vt
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conſtat. </
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Theorema
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51.
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Ex his ſatis facilè comparari poſſunt rationes percuſſionis,
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quæ infliguntur </
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