I am wrong in my attempt, yet I can't figure out the reason why...
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(solution with h=250 W/m^2*K instead of 350 W/m^2*K)
The Attempt at a Solution
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This is how I obtain the answers, which I checked all the calculations and I don't think there is numerical problem. I followed the steps in the solution manual, yet I am wrong and I don't know why.
Can anyone see anything going wrong here?
thank you so much!