Why do geostationary satellites all have the same orbital radius?

[bobby22]

Homework Statement

Geostationary satellites appear to remain stationary to an observer on Earth. Such satellites are placed in orbit far above the equator.

Using principles of physics, explain why such satellites all have the same orbital radius.

Homework Equations

The Attempt at a Solution

Is it because the sattilites stay on the same longitutal degree. they stay at the same spot and rotate with the earth.Thats why they seem sationary?

thanks in advance for any help

 

[pgardn]

Homework Statement

Geostationary satellites appear to remain stationary to an observer on Earth. Such satellites are placed in orbit far above the equator.

Using principles of physics, explain why such satellites all have the same orbital radius.

Homework Equations

The Attempt at a Solution

Is it because the sattilites stay on the same longitutal degree. they stay at the same spot and rotate with the earth.Thats why they seem sationary?

thanks in advance for any help

How long does it take a point on the equator to make one complete revolution?

How long would it take a satellite in orbit above this point to make one complete revolution?

 

[bobby22]

they are about the same. they are only about a minute off, not a huge difference