please explain each step

Problem 2. A steel ball initially at a uniform temperature of 100C is dropped into an insulated vessel containing water at 20C. Derive the appropriate governing equations for the temperature of the steel ball (Tb) and the temperature of the water (Tw). Determine the transient and steady state solutions for the temperature of water and steel ball as a function of the system parameters. Plot these profiles for the set of parameters with the mass of the ball (mb=1.25kg ), the mass of the water (mw=5kg), and the specific heats (Cb=3360J/gC,Cw=4200J/gC) and hA (the heat transfer rate) =4200J/sC. What do you observe