The doppler effect to explain the redshift of light from stars and galaxies, which provides evidence
that the universe is expanding
that the universe is collapsing
of cosmic microwave background radiation
for primordial helium gases

According to the phase diagram for water, how is the state of water determined? proceed up a vertical line at any given temperature read the phase at the intersection of any given temperature and pressure at a given pressure, proceed horizontally to the s-l or l-g line

The slope of a velocity time graph over any interval of time gives the during that interval

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?