(Solution) - Rework Problem 3 64 with the surface marked at a constant -(2025 Original AI-Free Solution)

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Rework Problem 3-64 with the surface marked at a constant 100ºC now absorbing a constant heat flux of 500 W/m2. Add nodes as necessary.
Problem 3-64
The two-dimensional solid shown in Figure P3-64 generates heat internally at the rate of 90 MW/m3. Using the numerical method calculate the steady-state nodal temperatures for k = 20 W/m· ºC.