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purpan 2017 QCM 3


yeehaw
Go to solution Solved by Chat_du_Cheshire,

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  • Solution

Hiii

 

Il faut isoler C2, et imaginer la fonction C2(C1) (à une seule variable donc car le reste est supposé constant)

 

On va dire que DA/L = k, pour simplifier les choses, donc k est une constante.

 

On a donc J = k (C1 - C2) = kC1 - kC2    donc -kC2 = J - kC1     donc  C2 = (J - kC1) /  -k   =  -J/k  +  kC1/k  = -J/k + C1, dont la dérivé donne 0 + 1 = 1 ! Cela ne dépend pas de J !

 

(je dérive car on nous parle d'incertitude absolue, ce qui correspond à différencielle -avec les valeurs absolues mais on s'en fout ici-)

Edited by Chat_du_Cheshire
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