Respostas

2013-08-15T19:35:51-03:00
Temos que:

Q = m*c*/\T

-500 = 400 * 0,110 * (tf - 20)

-500 = 44tf - 880

-500 + 880 = 44tf

380 = 44tf

tf = 380/44

**************************************************************
tf = 8,636 ~= 8,6°C (Temperatura final (aproximada))
**************************************************************

1 1 1