Consider the network for a two-dimensional system without internal volumetric generation having nodal temperatures shown below. If the grid space is 125 mm and the thermal conductivity of the material is 50 W/m. K. calculate the heat rate per unit length normal to the page from the isothermal surface (Ts).

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Node T ("C) 120.55 120.64 121.29 123.89 134.57 150.49 147.14 3 5 T,= 100°C 1234 567