Find the velocity of an object to become a satellite of Eart

[zade70]

Homework Statement

An object stand in the height 500km from the surface of the Earth. What velocity should it have to become an Earth satellite?

Homework Equations

a=v²/r

The Attempt at a Solution

v²=a*r=6,9*10⁷=>x=8306m/S , but the solution is 7600m/S

 

[markkrebs]

What's a? What's r? Watch units and you got your algebra wrong.

 

[mfb]

And what is x?

I would expect an error at the value of "a" you used.