An Antimatter Reactor when a particle meets its antiparticle, they annihilate each other and their mass is converted to light energy. The United States uses approximately 1.0 x 1019 J of energy per year.
(a) If all this energy came from a futuristic antimatter reactor, how much mass of matter and antimatter fuel would be consumed yearly?
(b) If this fuel had the density of iron (7.86 g/cm3) and were stacked in bricks to form a cubical pile, how high would it he? (Before you get your hopes up, antimatter reactors area long way in the future-if they ever will he feasible.)