Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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p = (α√2v + {mdv/√2v}): </
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xml:space
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p = 2v + {mdv/a}.</
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<
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xml:space
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">(α) Apparet inde ultimam definitionem quæſtionis pendere à ratione
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quæ intercedit inter d v & </
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<
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<
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xml:space
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">hanc vero in Sectione tertia generaliter defini-
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vimus, nulla tamen impedimentorum, quæ debentur caſui, facta attentione.
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</
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<
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<
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<
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xml:space
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">(β) Sequitur porro, ſi fluxus uniformis factus ponatur, eſſe p con-
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ſtanter = 2v, quia tunc dv = o: </
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<
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xml:space
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">Id vero conforme eſt cum eo, quod
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demonſtravimus §. </
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<
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xml:space
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">Donec vero fluxus incrementa accipit (quod qui-
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dem facit notabiliter, idque diu ſatis, ſi canalis E I longior fuerit) vas aliam
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atque aliam patitur vim repellentem.</
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<
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</
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<
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<
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xml:space
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">(γ) Habet dv ad α ſemper rationem realem: </
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<
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xml:space
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">ergo vis repellens nun-
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quam eſt nulla, ſic ut à primo fluxus tempore vas repellatur, etiamſi tunc
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aquæ fere nullæ effluant ob exiguam earundem velocitatem. </
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<
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xml:space
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">Verum, ut
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uſus regulæ noſtræ generalis unicuique pateat, eam nunc ad caſum ſpecia-
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l
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em applicabimus, tribuendo fiſtulæ EHID figuram cylindricam amplitu-
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dinis 1.</
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<
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cæteris poſitionibus & </
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">denominationibus, erit vis viva aquæ in fiſtula con-
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tentæ = mv; </
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<
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">hujus incrementum = mdv, cui addenda vis viva columel-
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læ H L M I ſeu a v, eorumque ſumma æqualis facienda facto ex altitudine,
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quam habet ſuperficies aquæ A B ſupra orificium H I, quamque vocabimus
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a, & </
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<
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">ex maſſula α. </
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<
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xml:space
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">Eſt igitur mdv + αv = αa, unde hic fit {dv/α} = {a - v/m}.
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</
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<
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">lſto autem valore ſubſtituto in æquatione ſuperioris paragrahi fit
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p = a + v. </
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unde talia deduco conſectaria.</
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<
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xml:space
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">(α) Longitudo fiſtulæ nihil ad vim repellentem, quam vas ſuſtinet,
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tribuit, ſi velocitas eadem ponatur, quia littera m è calculo evanuit, facit
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autem hæc longitudo (ſicuti in ſuperioribus ſatis ſuperque demonſtravimus)
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ut velocitates citiora aut lentiora incrementa capiant; </
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