One athlete in a race running on a long, straight
track with a constant speed v, is a distance d behind a sec-
ond athlete running with a constant speed u. (a) under
what circumstances is the first athlete able to overtake the
second athlete? (b) find the time t it takes the first ath-
lete to overtake the second athlete, in terms of d, v,, and
vy. (c) at what minimum distance d, from the leading
athlete must the finish line be located so that the trailing
athlete can at least tie for first place? express d, in terms
of d, v1, and v, by using the result of part (b).

Ifeel like lily and ledbetter had a fair pay act just because it was necessary especially at those times

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 -