Предмет: Физика, автор: Hoku2

2 Литра воды

За какое время вода закипит с Т=30 по цельсию

Приложения:

Ответы

Автор ответа: kotofeevicholeg
1

Ответ:

τ = 121,5 с

Объяснение:

Я так понял, что КПД = 100%. Исхожу из этого.

т.к. n = 100%, то

Ап = Аз; Аз = Nτ = U²τ/R; Aп = Q = mc(tк - T); m = ρV

U²τ/R = ρVc(tк - T)

τ = ρVc(tк - T)R/U²

tк = 100° C

τ = 1000*2*10⁻³*4200(100 - 30)*10/220²

τ = 121,5 с

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