# Thermal Expansion

1. Apr 11, 2010

### Lorinnn

1. The problem statement, all variables and given/known data

A brass ring of diameter 10.00cm at 20.0*C is heated and slipped over an aluminum rod of diameter 10.01cm at 20.0*C. Assuming the average coefficients of linerar expansion are constant, to what temperature must the combination be cooled to separate the two metals?

2. Relevant equations

$$\alpha$$ of brass = 19e-6
$$\Delta$$A = $$\gamma$$ A_o$$\Delta$$T

3. The attempt at a solution

That's the equation i believe i should be using, but somehow i don't really even know where to begin except for plug and chug. I'm supposed to get the answer of -179*C. =[ please help!
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution