What stage do cosmologists believe that the universe has evolved to be dominated by?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

Which is an example of an exothermic process?