# Earth Satellites

Physics

## example

### Time Period of revolution of satellites

Example: Assume that a satellite is revolving around Earth in a circular orbit almost close to the surface of Earth. What is the time period of revolution of satellite is Radius of earth is 6400 km, 9.8 ?

Solution: Time period of the satellite is given by
Almost close to surface of Earth
Time period
Time period seconds

## example

### Time Period of satellites

Example: A geostationary satellite orbits around the earth in a circular orbit of radius km. Then, the time period of a spy satellite orbiting a few hundred kilometers above the earth's surface  will approximately be
Given: km

Solution:
For a satellite of mass moving with a velocity in a circular orbit of radius around the earth of mass , we have
or
Now . Thus or
.....(1)
Given
and . For a geostationary satellite
. Using these values in (1), we have get .