1. Write the one-dimensional heat equation that could be used to determine the temperature in
(a) a flat circular disk with the flat surfaces insulated and
(b) a sphere with initial temperature a function of r only.
2. Determine the steady-state temperature distribution in
(a) a flat circular disk with sides held at 100?C with the flat surfaces insulated and
(b) a sphere with the outer surface held at 100?C