By using Ohm's law, we can find what should be the resistance of the wire, R:
Then, let's find the cross-sectional area of the wire. Its radius is half the diameter,
So the area is
And by using the resistivity of the Aluminum,
, we can use the relationship between resistance R and resistivity:
to find L, the length of the wire:
Element numbers 1,2,17,and 18
To develop this problem we will apply the concept related to heat transfer defined as the product between the transfer coefficient and the temperature difference between two spaces, that is,
Here,
h = Heat transfer coefficient
= Temperature at each point
- Interior air and inner wall:
- Outer wall to exterior air:
- Inner wall to interior air:
We can see that the magnitude of the heat fluxes in the three states are the same (The negative sign only indicates the change of direction) so the wall is in steady state conditions
In the Earths Crust. Because, the crust includes our land and, erosion occurs on land.