Space Shutte Centripetal force problem

[mayla1190]

Homework Statement

The space shuttle releases a satellite into a circular orbit 555km above the earth
how fast must the shuttle be moving when release occurs in m/s?

Homework Equations

V= square root ((GM)/r)
r= 555000
G= 6.67 * 10^-11
-mass was not given so I am not sure how to plug it in
-I got that equation but making force of gravity proportional to centripetal force

 

[iRaid]

How about you show what you did? That will help to see where you went wrong.

 

[I like Serena]

Welcome to PF, mayla1190!

You do need some extra information to solve this problem.
I think you need the radius of the earth, but you can look this up (6000 km).
From this you can also calculate GM (using g).

Btw, your r is not quite right, since you've neglected to include the radius of the earth.