Предмет: Физика, автор: parkxx

Срочно, помогите пожалуйста. Стальное изделие закалялось нагреванием до температуры 800°С с последующим опусканием в масло массой 2 кг, взятое при температуре 10°С. При этом масло нагрелось до температуры 40°С. Найти массу стального изделия, если при переносе в масло изделие охладилось на 20°С. Удельная теплоемкость масла 2100 Дж/(кг•°С).

Ответы

Автор ответа: n1k1ta013

Q=cm∆t
с(стали)=500Дж/кг•°С
Qи=Qм
mи - масса изделия →
500Дж/кг•°С * mи * 780°С=2100Дж/кг•°С * 2кг * 30°С
390000Дж/кг * mи=126000Дж
mи=126000Дж / 390000Дж/кг
mи=(прибл.) 323г

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