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## Homework Statement

Given data: A moon of mars orbits with a period of 459 minutes. The radius of the moon's orbit is 9.4x10^6 m. What is the mass of mars?

## Homework Equations

## The Attempt at a Solution

The only relevant equation I could find was F

_{mars on moon}= (G*m

_{1}*m

_{2})/(r

^{2})

I have the radius, but to solve I would need the mass of the moon and the gravitational force. Could I use F=mv

^{2}/r ? Or how about v= [tex]\sqrt{}GM/r[/tex] ?