Write the condition for the lumped system analysis. Determine the steady-state temperature in a slab of thickness L, initially at a uniform temperature of To. For time 0, heat is supplied to the slab from one of its boundary surfaces at a constant rute of g w/m, while heat is dissipated by convection from the other boundary surface into a medium at uniform temperature 7, with a heat transfer coefficient h. Assume a lumped system model based on the Fourier's law of heat conduction. Also, calculate the heat transfer rate through the constant cross-sectional area of A.