Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO QUARTA.
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enim foramen digito obturamus, moxque remoto digito aquas horizontali-
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ter effluere ſinimus, nullam guttulam in terram delapſam obſervamus me-
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diam inter jactum longiſſimum & </
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<
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reſpondeat.</
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<
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xml:space
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">Prouti in proximo paragrapho determinavimus quantitates ut-
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ut infinite parvas, deſcenſus aquæ internæ uti & </
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<
s
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xml:space
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">effluentis aquæ dum maxi-
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ximum velocitatis gradum aqua attingit, ita nunc idem præſtabimus ratione
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tempusculi. </
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<
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">Dico eutem ſufficere in æquatione §. </
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<
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<
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">tempus exprimente,
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ut in utraque ſerie unicus accipiatur terminus primus, quod apparebit cum
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quis calculum ad duos extenderit terminos: </
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<
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xml:space
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">eſt igitur tempuſculum quæſi-
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tum ſive
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t = (2 - 2√{x/a}) X {√(mmαα - 2nn).</
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<
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hinc poſito pro x valore huc pertinente, qui in præcedente paragrapho fuit
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definitus, fit
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t = [2 - 2√1 - (log.</
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">{mmαα/nn}): </
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">{mmαα/nn}] X √({mmαα - 2 nn/nn})·a
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vel poſito 1 - (log. </
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">{mmαα/nn}): </
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xml:space
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">{2mmαα/nn} pro reſpondente quantitate ſigno ra-
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dicali involuta prodit
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t = [(log.</
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xml:space
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">{mmαα/nn}] X √({mmαα - 2nn/nn})·a}
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aut denique rejecta quantitate 2 nn in ſigno radicali, oritur t = {2n√a/mα}.</
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<
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<
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">Eſt autem hoc tempusculum infinite parvum, quia, ut notum eſt, lo-
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garithmus quantitatis infinitæ infinities minor eſt ipsâ quantitate. </
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cum ſic ſtatim ab initio fluxus, aqua maxima ſua velocitate expellitur, mi-
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rum prima fronte videbitur fortaſſe aliquibus, motum in inſtanti generari
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finitum: </
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<
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">nemo tamen abſurdum putabit, maſſam infinitam, cujusmodi
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eſt quantitas aquæ in vaſe infinito contentæ, poſſe tempuſculo infinitè parvo
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motum producere finitum, idque ſolâ gravitatis actione.</
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<
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">Si præterea in iſta vaſis infinite ampli poſitione tempus deple-
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tionis, quod utique infinitum erit, exprimere velimus, erit, ut ſupra </
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