Asolid cylinder is mounted above the ground with its axis of rotation oriented horizontally. a rope is wound around the cylinder and its free end is attached to a block of mass 53.0 kg that rests on a platform. the cylinder has a mass of 275 kg and a radius of 0.360 m. assume that the cylinder can rotate about its axis without any friction and the rope is of negligible mass. the platform is suddenly removed from under the block. the block falls down toward the ground and as it does so, it causes the rope to unwind and the cylinder to rotate.(a)what is the angular acceleration of the cylinder? rad/s2(b) how many revolutions does the cylinder make in 5 s? rev(c)how much of the rope unwinds in this time interval? m

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 -