F) Traffic lights on some streets are timed to facilitate traffic flow at a certain speed. Goofus and Gallant
are stopped at a red light on this kind of street. When the light changes Goofus hammers the
accelerator until he exceeds the speed limit. He arrives at the first light which is still red and stops.
Gallant accelerates at a reasonable rate and never exceeds the speed limit. The second light turns green
at just the right instant so that he never needs to brake at an intersection. Goofus and Gallant continue
driving this way for three lights.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -