Please answer now, i will give brainy award A pendulum, as shown below, has a mass of 1 kg and starts its swing from rest at position
A. The pendulum swings past the lowest point B up to point C, which is at the same height
as point A. Points A and C are 0,866 m apart and BC is 0,5m

11.1) Define the term 'kinetic energy'.

11.2) Calculate the gravitational potential energy of the pendulum at point A.
(5)

11.3)calculate the maxim speed that the pendulum will reach.
(4)

11.4) By referring to the law of conservation of mechanical energy, explain how the
maximum velocity will change if the height is increased four times.
(2)

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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 -