Aball is released at the point x = 2 m on an inclined plane with a nonzero initial velocity. after being released, the ball moves with constant acceleration. the acceleration and initial velocity of the ball is described by one of the following cases: case 1 a > 0 v0 > 0; case 2 a > 0 v0< 0; case 3a< 0 v0 > 0; case 4a < 0 v0 < 0
(a) in which of these cases will the ball definitely pass x = 0 at some later time?
(b) in which of these cases is mo/re information needed to determine whether the ball will cross x = 0?

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 -

Bag of bolts weight 29.4n