Can someone pls help me with science?
I will mark brainliest!

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules