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Quick question on orbital speed of satellite

  • Thread starter dezhiz
  • Start date
  • #1
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Homework Statement


The polar orbiting satellite NOAA-N was launched in May 2005. The satellite is now moving in a circular orbit above the Earth's surface at an altidude of 870 km. THe mass of the Earth is 5.97 x1024kg and its mean radius is 6.38 x106m.

Show that the orbital speed of the satellite is 7.41 x103ms-1

Homework Equations


i used v=√GM/r
where G = 6.67 x10-11

The Attempt at a Solution


What I got was..
v = √(6.67 x10-11)(5.97 x1024)/6.38 x106
v = 7.86 x103ms-1

What am I doing wrong? D:
 

Answers and Replies

  • #2
D H
Staff Emeritus
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You are using 6.38x106 meters as the satellite's orbital radius. That value is the mean radius of the Earth, not the orbit.
 
  • #3
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ah yea.... Thanks!
 

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