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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 x10

^{24}kg and its mean radius is 6.38 x10

^{6}m.

Show that the orbital speed of the satellite is 7.41 x10

^{3}ms

^{-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 x10

^{24})/6.38 x10

^{6}

v = 7.86 x10

^{3}ms

^{-1}

What am I doing wrong? D: