✔ 最佳答案
You know the energy absorbed by the bread. Call that E.
2*E = 0.4kg * 4186J/kg·ºC * (T - 4ºC)
using the specific heat of water. If you have a different specific heat for milk, use that instead.
Solve for T.
The answer should be lower (in fact, MUCH lower) than 50ºC since water has a higher specific heat than almost everything. If you're getting something on the order of 190ºC then you are making an error somewhere.