Aball on the end of a string is whirled around in a horizontal circle of radius 0.273 m. the plane of the circle is 1.31 m above the ground. the string breaks and the ball lands 2.87 m away from the point on the ground directly beneath the ball’s location when the string breaks. the acceleration of gravity is 9.8 m/s 2 . find the centripetal acceleration of the ball during its circular motion. answer in units of m/s 2

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 -