Examination 2021 Two bodies A and B of masses 100g and 400g respectively are moving
towards each other with a speeds 100cm/s and 10cm/s.
They suffer a
head-on collision and stick together.
(i) In which direction will the combined mass move after the collision?
(02 marks)
(ii) What will be the distance travelled by the combined mass after 10
seconds.
(01 marks)
(iii) Assuming the two bodies to be originally at the same temperature and
specific heat of both the two bodies to be 0.1Jg-'K-1, calculate the rise
in temperature of the combined mass after the collision. (02 marks)​

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 -

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Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;