Calculate the distance of the galaxies with the following redshifts (assume a Hubble Constant of H0 = 72 km/s/Mpc): [10 pts.]
Redshift Distance
(z) (Mpc)
0.02
0.1
0.2
0.5

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Idon’t quite understand this problem