Satellite, magnitude/acceleration problem

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To calculate the acceleration due to gravity at a satellite's orbit 3.59*10^7 m above Earth's surface, the formula g = G * (M / r^2) can be used, where G is the gravitational constant, M is Earth's mass, and r is the distance from Earth's center. The radius r is the sum of Earth's radius and the altitude of the satellite. The mass of the satellite is not needed for this calculation, as gravity depends only on the mass of the Earth and the distance from its center. Users discussed the importance of understanding the relationship between gravitational force and distance in orbital mechanics. Proper application of these principles allows for accurate calculations of gravitational acceleration for satellites.
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Satellites are placed in a circular orbit that is 3.59*10^7 m above surface of earth. What is the magnitude of the acceleration due to gravity at this distance? A formula to use or the work would be appreciated. Thanks.
 
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Show how you started, please.
 
I tried using F=G(m1*m2)/r^2. i didnt know the mass of the satellitle though so i was left with multple variables. I also tried using g, but that didnt work. I guess I really don't know how to start when the satellite has an unknown weight.
 

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