решение 84кДж=84000Дж
Q=cm(t2-t1)m=Q/c(t2-t1) m=84000/4200*10=2кг
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решение
84кДж=84000Дж
Q=cm(t2-t1)
m=Q/c(t2-t1)
m=84000/4200*10=2кг