# Homework Help: Period of orbit around earth

1. Dec 9, 2008

### gemini2904

1. The problem statement, all variables and given/known data

A space station is placed in an orbit of radius 30 000km. What is the period of the station's orbit around the Earth?

(I previously worked out the period of rotation of the space station as 22 secs but I didn't think it was relevant to this part of the question besides it's probably wrong anyway!!!! For that question the wheel shaped station, with radius 20m, rotating around a central hub. astronaunt standing on rim head facing forward , feels force on feet, to stimulate 1/6 of the magnitude of gravity on earth)???

2. Relevant equations

I was looking to use T = 2pi

but Instead of Rearth do I need to use the radius 30 000? Or have I got the wrong equation again!?!?

Many thanks,

Claire

3. The attempt at a solution

T = 6 mins edit; opps i mean 84mins I don't understand how the radius of 30000 fits in, should I take it as distance?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Last edited: Dec 9, 2008
2. Dec 9, 2008

3. Dec 9, 2008

### gemini2904

Oh right sorry - I didn't realise, I just wanted to edge my bets!!!

4. Dec 9, 2008

### Dick

Actually, you "hedge" your bets. But double posting is not the way to do it.

5. Dec 10, 2008

### gemini2904

Thank's for clearing that up, Dick!