What do astronomers use to calculate the age of the universe? Select three options,
dark energy
the age of rocks on Earth
the age of the oldest stars
patterns of background radiation
how fast distant galaxies are moving away from us

The dissociation energy of a molecule is the energy required tobreak apart the molecule into its separate atoms. the dissociationenergy for a particular molecule is 5.48 x 10-18 j.suppose that this energy is provided by a single photon. determinethe (a) wavelength and (b) frequency of the photon

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity