transport phenomenion problem

by buchi
Tags: phenomenion, transport
buchi is offline
Oct11-11, 07:00 AM
P: 7
i got this from my notws and i jsut can't seem to figure out how the second step is obtained? can someone explain to me where the where r's in the numerator came from on the second line when dividing by the volume of the shell?
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matematikawan is offline
Oct12-11, 12:31 AM
P: 330
That is the original r from the previous equation.

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