please explain in detail by hands (not copy paste) thank you in advance

5-84 Consider a large uranium plate of thickness L = 8 cm, thermal conductivity k = 28 W/m. C, and thermal diffusivity a = 12,5 x 10 m/s that is initially at a uniform temperature of 100C. Heat is generated uniformly in the plate at a constant rate of g = 10W/m . At time 1 = 0, the left side of the plate is insulated while the other side is subjected to convection with an environment at T = 20C with a heat transfer coefficient of h = 35 W/m. C. Using the explicit finite difference approach with a uniform nodal spacing of Ar = 2 cm, determine (a) the temperature distribution in the plate after 5 min and (b) how long it will take for steady conditions to be reached in the plate