# Homework Help: Temperature and Heat

1. May 9, 2006

### superdave

A .1 kg piece of aluminum at 90 degrees C is submerged in 1 KG of water at 10 degrees C. What is the temperature when they reach equalibrium?

Now I know, aluminum has a c of 920 J/(kg * degree C) and water has a c of 4186 J/(kg * degree C).

I'm not sure how to approach this.

Best I can think of is setting m*c*dT for the water equal to m*c*dT for the aluminum. But I have two unknown variables there. (The dT's) So that can't be right. Help is appreciated.

2. May 9, 2006

### FredGarvin

What is the definition for your delta T? It is $$\Delta T = T_{end} - T_{start}$$

Does that point you in the right direction? Also, think about the physical situation when the two have reached equillibrium...

3. May 9, 2006

### Andrew Mason

This means you will need to work out two equations to determine the values of these two different delta T's.

AM