An astronaut needs to speed up.

astr

A satellite completes 7 revolutions around the Earth in a day. For whatever reasons, an astronaut needs to speed up the satellite’s movement, so as to make 10 revolutions around the Earth in a day. What should the astronaut do?

 


Solution. Posted on Friday, November 21, 2014.

The Astronaut should decrease the speed. The kinetic energy of the satellite will decrease and the potential energy of the satellite increase. The satellite will go on the lower orbit. Finally, according the Kepler’s law, the period of the one revolution will decrease and satellite will increase the amount of revolutions around the Earth in a day.

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