work out the problem, find the actual answer Required information

A common annoyance in cars during winter is the formation of fog on the glass surfaces that blocks the view. A practical

way of solving this problem is to blow hot air or to attach electric resistance heaters to the inner surfaces. Consider the

rear window of a car that consists of a $0\mathrm{.}4-cm-$thick glass $(k=0\mathrm{.}84\frac{W}{m}*K$ and $=0\mathrm{.}39{10}^{-6}\frac{m}{2}\frac{?}{s}).$ Strip heater wires of

negligible thickness are attached to the inner surface of the glass, $4$ cm apart. Each wire generates heat at a rate of $25\frac{W}{?}$

coefficients at the inner and outer surfaces of the glass can be taken to be $h_j=6$ and $h_0=20\frac{W}{m^2}*K,$ respectively. Use

the explicit finite difference method with a mesh size of $x=0\mathrm{.}2cm$ along the thickness and $y=1cm$ in the direction

normal to the heater wires.

Determine the temperature at node $4,15$ min after the strip heaters are turned on$.$