A hot brass plate is having its upper surface cooled by impinging jet of air at temperature of $15C$ and convection heat

Q$1$

transfer coefficient of $220\frac{W}{m^2}*K.$ The $10-cm-$thick brass plate $,$ and $=33\mathrm{.}9{10}^{-6}\frac{m^2}{s})$ had a uniform initial temperature of $650C,$ and the lower surface of the plate is insulated. Using a uniform nodal spacing of $x=2\mathrm{.}5cm$ and time step of $t=10s$ determine $(a)$ the implicit finite difference equations and $($b$)$ the nodal temperatures of the brass plate after $10$ seconds of cooling.