A2 kg picture frame sits on a shelf at a height of 0.5 m. how much gravitational potential energy is added to the picture frame when it is lifted to a shelf of height 1.3 m? acceleration due to gravity is g = 9.8 m/s2.

a.10.23 j b.15.68 j c.25.48 j d.9.80 j

We know that:
Epg=mgΔh
Epg=2kg*9,8m/s²*0,8m
Epg=15,68J (b)

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 -

Wavelength divides in half and speed stays the same.