Q:  What is the angular momentum of the rod
           around the pin, before the collision?

               L(rod)  =  (1/2) * M * L^2 * (zero)

                       =   0


  Q:  What is the angular momentum of the putty
           around the pin, before the collision?

               L(putty)  =  m * v * L * sin(90 degrees)

                         =  m * v * L     out of page

                         =  2.88 kg*m^2/s   out of page

  Q:  What is the total angular momentum of the
           system around the pin, before the collision?

               L(total)  =  L(rod)  +  L(putty)

                         =  2.88 kg*m^2/s   out of page