Orbital speed of a satellite.

  • Thread starter JohnnyB212
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  • #1
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Homework Statement



A satellite is in circular orbit above the Earth at an altitude of 7000 km. What is the orbital speed of the satellite?


Homework Equations



Well, knowing that the mass of earth of 5.98 X 10^24 kg

And the radius of earth is 6.38 x 10^6 m



What equation do I start with here? The "speed" portion is whats getting me. :frown:
 

Answers and Replies

  • #2
mgb_phys
Science Advisor
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Orbit means that the gravitational force inward and the centrifugal force outward are balanced. The centrifugal force depends on the angular speed and this with the radius will give you the speed.
 
  • #3
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First you need to find the Fg and that would be using the GM/R^2 formula once u have Fg you can get v using mv^2/r
 

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