Помогите решить задачи!
Задача 1:
Дано:
m-4 кг.
r-290 Дж\кг
----------------------
Q-?
Задача 2:
Дано:
m-2 кг.
t1-78 °С
t2-18 °С

 с-2,5 Дж\кг
r-900 Дж\кг
-----------------------
Q-?
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