3. (Totally 16 points) Consider a long bar of rectangular cross section (LH=0.6m0.3m ) that is subjected to the boundary conditions as shown below. Assume constant properties, no heat generation, and steady-state conditions. (a) (2 points) Define the domain for heat conduction analysis (b) (3 points) Build a nodal network with a grid spacing of 0.1m and id the nodes at which the temperatures are to be determined (c) (9 points) Write the finite difference equations of temperature for the nodes with ids (d) (2 points) Calculate the temperatures at nodes