# Hubble Constant (in km/s/Mpc)

## 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)?

## The Attempt at a Solution

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ideasrule
Homework Helper
Do you know Hubble's equation?

## 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
Homework Helper
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.

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
Homework Helper
Subtract?

Sorry...it was late.

Divide.