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What happened to the negative sign?

Thread starter EastWindBreaks
Start date Apr 22, 2018
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Heat transfer Negative Sign Thermodaynamics

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EastWindBreaks

Thread starter
Apr 22, 2018

#1

Homework Statement

Homework Equations

The Attempt at a Solution

I thought it would become d/dx(-kAc*dT/dx)+hp(T-T)=0 instead of where the equation in the red box? I don't see how are they equivalent [/B]

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haruspex

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Apr 22, 2018

#2

EastWindBreaks said:

I don't see how are they equivalent

Compare the signs on the hp() terms.

EastWindBreaks

Apr 22, 2018

#3

haruspex said:

Compare the signs on the hp() terms.

silly me, thank you!

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