Respuesta :

AL2006

-- a tiny bead rolling around a 1-inch circle
   at the speed of 3 yards per second;

-- a point on the inner rim of a CD (the edge of
    the hole) while the CD is playing; 

-- a point on a figure skater's heel while she's
   doing a spin;

-- a bullet, just after it's fired, but while it moves the
   first inch from the cartridge up the barrel of the rifle;