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rublevaoe392
05.06.2022
M1 = 500 г c1 = 2100 Дж/кг°с m2 = 300 г с2 = 540 Дж/кг°с t2 = 100°c t3 = 20°c
t3 - t1 -?
500 г = 0,5 кг 300 г = 0,3 кг
Раз гирька остыла до 20 градусов, значит и керосин нагрелся до 20 градусов, то есть до t3.