Question: Consider a bar of square cross section. Write the finite-difference formulation of the problem for the grid shown in Fig. Solve these equations by
(a) iteration,
(b) direct elimination.
Data: u"' = 106 W/m3, L = 20 mm, k = 20 W/m·K, h = 700 W/m2·K, T∞ = 25 °C.
