Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
ASTRONOMY CALCULATION - NEED HELP?
If someone could help me do this question I could really appreciate it. I'm not trying to get people to do my homework for me but I missed the class for this calculation and now I can't figure it out - I've done the rest of the assignment but don't know how to do this one last one.
Here's the question:
According to Hubble's law, with H0=70km/s/Mpc, how long will it take for the distance from the Milky Way Galaxy to the Virgo Cluster to double?
The answer is to be in seconds
1 Answer
- 6 years agoFavorite Answer
Hubble's law is V = H0 * D
D is in Mpc
V is in km/s
H0 is in km/s/Mpc
You want to find the velocity first. You know H0 is 70, and you can find the distance from the milky way to the Virgo cluster from an online source or your textbook. Let's assume it is 16.5 Mpc (from Wikipedia). So now, solving for V:
V = 70 * 16.5
V = 1155 km/s
Now all we need to do is take the distance from the milky way to the Virgo cluster in kilometers (Use a converter online)
I found a value of 5.09 * 10^20 km, but your textbook may say something different.
Now simply divide one by the other to find your answer in seconds:
5.09 * 10^20 km / 1155km = 4.4 * 10^17 seconds
Note: Your answer will be 3.1 * 10^17 seconds using textbook values, but 4.4 * 10^17 seconds will be accepted.
PS: Red hat is God.