Предмет: Физика, автор: nastamarkovic444

Какое количество теплоты нужно для нагревания стальной детали массой 7 г от 25 до 725 °С?

Ответы

Автор ответа: vencherbiber

1

Ответ:

Объяснение:

m1 7г = 0.007 кг

с1 460 Дж

t1 25°c

t2 725°c

знайти:

Q - ?

розв'язання:

Q = m*c*(t2-t1)

Q = 0.007*460*(725-25)

ответ 2254 Дж

Автор ответа: 1Manka1

0

Ответ:

2450Дж

Объяснение:

Дано:

m=7г=0,007кг

с=500Дж/кг°С

∆t=725-25=700°C

========

Q-?

Q=cm∆t=500*0,007*700=2450Дж

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