For breakfast you prepare soluble coffee 600 ml of water (1000 ml = 1000 g water) at 92 ° C. If you take 200 ml in a cup, to which you add 25 g of water at 15 ° C to lower its temperature:
What is the final temperature of coffee? It considers that the specific heat is the same for water and brewed coffee.
The remaining 400 ml of the empty brewed coffee in a thermos and as has cooled a little while acctually now has a temperature of 89 ° C. At noon, when you take your coffee at lunch you realize that you have the same temperature. Why the temperature of the brewed coffee in the thermos remained?
Who wins heat?
What is the magnitude of the gain?
What is the temperature of the thermal equilibrium?