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## Homework Statement

The question i need help on is question 6 part (c). I think I need to use the equation:

**2. Equations used:**

[tex]\Delta[/tex]L = [tex]\alpha[/tex]L[tex]\Delta[/tex]T

Linear expansion of steel: 12x10 K^-1 ([tex]\alpha[/tex])

Density of steel: 7800

**3. My attempted solution:**

I tried substituting in the values into the equation but the question did not mention anything about the length of the steel so now i am stuck for a solution. I tried using proportionality with density=mass/volume so density is proportional to 1/L. However im not sure this if this is the correct way.

Thanks for your help in advance.

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