• Support PF! Buy your school textbooks, materials and every day products Here!

Hubble Constant (in km/s/Mpc)

  • Thread starter Solomon9$
  • Start date
  • #1
4
0

Homework Statement


A galaxy is observed to be receding from the Sun with a velocity of 7500 km/s.
The distance to the galaxy is determined to be 1.4×10^8 parsecs. From this
observation, what is the value of the Hubble Constant (in km/s/Mpc)?


Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
ideasrule
Homework Helper
2,266
0
Do you know Hubble's equation?
 
  • #3
4
0

Homework Statement


A galaxy is observed to be receding from the Sun with a velocity of 7500 km/s.
The distance to the galaxy is determined to be 1.4×10^8 parsecs. From this
observation, what is the value of the Hubble Constant (in km/s/Mpc)?


Homework Equations



recessional velocity = H^o x distance

The Attempt at a Solution

Not sure if recessional velocity in this equation is in km/s and distance in parsecs. Need help with this.
 
  • #4
ideasrule
Homework Helper
2,266
0
For any equation in physics, it doesn't matter what units you use; a relationship between physical quantities doesn't depend on how said physical quantities are measured. However, you do have to include the units in your calculations and convert when appropriate.
 
  • #5
4
0
so am I to simply subtract 7500 km/s from 1.4×108 parsecs to solve for Hubble Constant (in km/s/Mpc)? Seems too easy...
 
  • #6
ideasrule
Homework Helper
2,266
0
Subtract? :confused:
 
  • #7
4
0
Sorry...it was late.

Divide.
 

Related Threads on Hubble Constant (in km/s/Mpc)

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
2K
Replies
9
Views
2K
Replies
4
Views
589
Replies
6
Views
5K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
916K
  • Last Post
Replies
3
Views
16K
  • Last Post
Replies
4
Views
7K
Top