Write a steady-state nodal equation for node 3 in Figure P4-82 assuming unit depth perpendicular to the

Question:

Write a steady-state nodal equation for node 3 in Figure P4-82 assuming unit depth perpendicular to the page and using the node spacing shown. The thermal conductivity of the solid is 15W/m· ºC and the convection heat-transfer coefficient on the side surface is 25 W/m2 · ºC.
Figure P4-82