P=I^2R=(4+2t)^2R. Q=∫P(t)= R∫(4+2t)^2dt=R(4+2t)^3/6(от t1 до t2)≈2900 Дж.
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P=I^2R=(4+2t)^2R. Q=∫P(t)= R∫(4+2t)^2dt=R(4+2t)^3/6(от t1 до t2)≈2900 Дж.