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surface except for the ends. The steady-state temperature

distribution is T(x) = a-bx/L, where a = 305 K

and b =10 K. The diameter and length of the rod are

D = 20 mm and L =100 mm, respectively. Determine

the heat flux along the rod, Hint: The mass of the rod

is M = 0.248 kg.

T(x) = 305 - 100x.

dT(x)/dx = -100.

I know that heat flux is modeled by Fourier's Law for conduction: qx'' = -k*dT/dx. What I'm having trouble finding is the conductivity k and I'm wondering whether it has something to do with the mass of the rod, although I am not seeing the connection here.

Thanks.