Dato il sistema di quattro masse puntiformi m1 = 15 N, m2 = 30 N, m3, = 20 N, m4 = 25 N, applicate rispettiva- mente nei punti A = (2; 6), B = (7; 1), C = (3; 4),
D = (5; 3), calcolare il momento d'inerzia assiale del
sistema rispetto all'asse cartesiano x e rispetto all'asse xo
baricentrico con la formula derivata da trasposizione.

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 -

It really doesn't matter for any of the questions that you've listed.