What is the Calculated Value of the Hubble Constant from Galaxy Observations?

[Solomon9$]

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

 

[ideasrule]

Do you know Hubble's equation?

 

[Solomon9$]

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.

 

[ideasrule]

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.

 

[Solomon9$]

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...

 

[ideasrule]

Subtract?

 

[Solomon9$]

Sorry...it was late.

Divide.