Q:   In a future advanced civilization, Fred tosses an apple core,
           of mass 0.010 kg, into his Hole-A-Way garbage
           disposal unit.  The apple core is sent into an accretion
           disk around a black hole, and 3 percent of its mass is
           converted to energy.  How many Joules are released?

 
               E  =  0.03 * 0.010 kg * (3 x 10^(8) m/s)^2

                  =  9 x 10^(14) J
                


       Compare that to the amount of energy required to run the RIT
           campus for one year: about 6 x 10<sup>14</sup> J
           (see https://www.rit.edu/sustainablecampus/energy).


               The apple core can provide all the energy RIT needs
                   for a full year!