A40kg rock is perched atop a cliff that is 50 m high. what is it’s potential energy?

Potential energy, is energy due to its position.

Given: Mass m = 40 Kg;  Height h = 50 m

Required: Potential energy P.E = ?

Formula:  P.E = mgh   P.E = (40 Kg)(9.8 m/s²)(50 m)

                P.E = 19,600 J

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 -