Предмет: Физика, автор: Аноним

номер 871, зарание спасибо

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Автор ответа: MashaPutnaj

Дано t1=39C t2=1539C c= Q- ?

1) нагревание железа
Q1=c*m*(t2-t1)=

2) тепло для плавления Q2=л*m=

3) Q= Q1+Q2

для решения нужен ваш задачник а я из России у нас другие учебники

Автор ответа: kirills1

Q = Q1 + Q2

Q1 = cmΔt

c - удельная теплоёмкость ( для железа 444 Дж / кг * С )
m - масса ( 4 т = 4000 кг )
Δt - разности температур ( 1539 С - 39 С = 1500 С )

Q1 = 444 * 4000 * 1500 = 2664000000 Дж

Q2 = λ * m

λ - удельная теплота плавления ( для железа 277000 Дж / кг )
m = 4000 кг

Q2 = 277000 * 4000 = 1108000000 Дж

Q = Q1 + Q2 = 2664000000 + 1108000000 = 3772000000 Дж = 3,772 ГДж

kirills1: Благодарю за лучший!)))

kirills1: Давайте

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