Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same moment the density of this Universe is ρ. (a) Confirm for yourself that this is a closed universe, given the values below. (b) Determine, and enter below, the spatial radius of curvature for this closed universe (at the same moment in time at which the values above are given). Values: H = 90 km s-1 Mpc-1 ρ = 4.2x10-26 kg m-3
Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same moment the density of this Universe is ρ.
(a) Confirm for yourself that this is a closed universe, given the values below.
(b) Determine, and enter below, the spatial radius of curvature for this closed universe (at the same moment in time at which the values above are given).
Values:
H = 90 km s-1 Mpc-1
ρ = 4.2x10-26 kg m-3
Please show work because I have trouble following along
Given that for a universe
Rate of expanding
H = 90 km s-1 Mpc-1
And at this time the density
ρ = 4.2x10-26 kg m-3
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 1 images
In part b, I believe you accidently used 2.4*10-26 instead of 4.2*10-26. Using 4.2*10-26 gives the answer of 6.9*1012. Thank you for working on this I was having confusion between using rho and episilon.
by Bartleby Expert