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# Satellite watch

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1. calculate the work done to locate a 150kg satellite into a geostationary orbit.

I'm guessing i need to use ep=- GMmG/r
but it would be possitive right? oR negative

the radius will be 35800 km? or 42,245 cause the 35800 is the altitude for the satellite????? So is the 35800 or 42,245 km the orbital radius for a geostationary satellite for Eartj
m and M is mass of earth and the satellite
so is this how to work out the right answer

6.67*10^-11 (mass of eath)(150)
-----------------------------------------
35800000 or 42,245 000
Is this the correct way.

Also is this the right forumla to figure the orbital radius for a geostationary satellite for any planet?
r = Gm ^1/3
---
4 (pie)^2

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Updated: November 11, 2005
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