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dR<br />
dt<br />
=<br />
2 ( R + r)<br />
( V −V<br />
)<br />
R<br />
Assumindo que E(R,r) e W l são constantes, V2 >> V1 e<br />
dR<br />
dt<br />
2<br />
=<br />
V<br />
2<br />
EWl<br />
4ρ<br />
MODELO DE BOWEN<br />
2<br />
4ρ<br />
l<br />
1<br />
l<br />
E<br />
( R,<br />
r)<br />
Wl<br />
( R + r)<br />
R<br />
2<br />
2<br />
≅ 1