A large slab of brick [k = 1.07W/m C, = 5.4 107m2/s] is initially

A large slab of brick [k = 1.07W/m · ºC, α = 5.4 × 10−7m2/s] is initially at a uniform temperature of 20ºC. One surface is suddenly exposed to a uniform heat flux of 4500 W/m2. Calculate and plot the surface temperature as a function of time. Also calculate the heat flux through the plane 2.0 cm deep when the surface temperature reaches 150ºC.