Bernoulli, Daniel, Hydrodynamica, sive De viribus et motibus fluidorum commentarii

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8268HYDRODYNAMICÆ.
a: ({mmαα - nn/nn}){nn: (mmαα - 2nn)} = a: ({mmαα/nn})nn: mmαα
quoniam
autem {mmαα/nn} eſt numerus infinitus, poterit cenſeri:
({mmαα/nn})nn: mmαα = 1 + (log. {mmαα/nn}): {mmαα/nn};
cujus
rei demonſtratio talis eſt:
propoſita ſit quantitas infinita A habeaturq; ut in
noſtro
exemplo A1: A, facile quisque videt eſſe hanc quantitatem paullo majo-
rem
, quam eſt unitas, &
quidem exceſſu infinite parvo, quem vocabimus
z
;
habetur itaque A1 : A = 1 + z, ſumantur utrobique logarithmi & erit
{log.
A/A} = log. (1 + z) = (ob infinitè parvum valorem ipſius z) z; Igitur
eſt
A1: A = 1 + {log.
A/A}: proindeque ſimiliter eſt, ut diximus,
({mmαα/nn})nn: mmαα = 1 + (log.
{mmαα/nn}): {mmαα/nn}
Porro quia quantitas hæc unitati addita eſt infinitè parva, erit
a
:
({mmαα/nn})nn: mmαα ſeu
a
:
[1 + (log. {mmαα/nn}): {mmαα/nn}) = a - a (log. {mmαα/nn}): {mmαα/nn}:
eſt igitur ſpatium per quod ſuperficies aquæ deſcendit, dum à quiete maxi-
ma
oritur velocitas = a (log.
{mmαα/nn}): {mmαα/nn}, ſeu = {2nna/mmαα} log. {/n}.

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