A thick oak wall initially at $25C$ is suddenly exposed to gases for which $T_{}=800C$ and $h=20\frac{W}{m^2}*K.$ Answer the following

questions.

Note: Evaluate the properties of the wall as cross grain oak at $300$ K $.$

What is the surface temperature, in $C,$ after $200$ s $?$

$T(0,200sec)=$

Will the surface of the wall reach the ignition temperature of oak $(400C)$ after $200$ s $?$

What is the temperature, in $C,1mm$ from the surface after $200$ s $?$

$T(1mm,200sec)=$