Heat transfer coefficient

1. The problem statement, all variables and given/known data and the attempt at the solution

Alright, here is a picture of the problem along with my solution:

My solutions gives the correct answer but the only part I don’t understand is why the heat transfer coefficients are the same. If the two rods are made of different materials don’t you have a different coefficient? Or is coefficient independent of the material… If so, what does it depend on? Shape?


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