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Heat flux differential equation question watch

1. (Original post by Azzer11)
...
Seems to me like you need to first use the given expressions then say

Then use Taylor's expansion for it about the point to determine , and only then approximate the value at
2. (Original post by RDKGames)
Seems to me like you need to first use the given expressions then say

Then use Taylor's expansion for it about the point to determine , and only then approximate the value at
Okay I see, I assume I differentiate T(x) to get dT/dx for the equation though?
3. (Original post by Azzer11)
Okay I see, I assume I differentiate T(x) to get dT/dx for the equation though?
Oops yeah I didn't notice they put the derivative of it in the equation. Yes you need to differentiate it first.

4. I did the taylor expansion at centre 4, do I then sub in x=3 to get q(3)? I'm a bit confused
5. (Original post by Azzer11)

I did the taylor expansion at centre 4, do I then sub in x=3 to get q(3)? I'm a bit confused
What's confusing?

The first term of will be which is which indeed simplifies to as expected.

To get you sub in yes.

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Updated: March 13, 2018
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