Two boats are anchored in the harbor, separated by a horizontal distance of 18 m.

The boats bob up and down as waves enter the harbor. When one boat is at its

highest point, the other is at its lowest point and there are no wave crests between

them. Each boat makes exactly 5 complete up-and-down cycles every 10.0 s. The

vertical distance between a boat's highest and lowest position is 2.6 m.

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 -