Question

rezolvati problema va rog dau 100 puncte

Answer 1

Salut,

$\Delta U_{31}=U_1-U_3;\\\\\Delta U_{12}=U_2-U_1\\\Delta U_{23}=U_3-U_2,\ deci:\ \Delta U_{12}+\Delta U_{23}=U_3-U_1\Rightarrow\\\Rightarrow U_1-U_3=\Delta U_{31}=-(\Delta U_{12}+\Delta U_{23})=-(700-180)=-520\ J.$

Green eyes.