orbital radius = 6370+320=6690km
orbital circumference is thus 2pi*6690 = 42034km
divide that (in meters) by 800 m/s to get the period in seconds.
The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds?
Details and assumptions
The radius of the earth is 6370 km.
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