Answer :
-21.7 km²/s is the angular momentum (in km 2/s) of the earth's satellite.
What is a satellite?
- An object that has been sent into orbit in space on purpose is known as a satellite or artificial satellite.
- Most spacecraft, with the exception of passive satellites, contain a means of generating power for the technology they carry, such as solar panels or radioisotope thermoelectric generators (RTGs).
- The majority of satellites also feature transponders, which are a type of ground station communication system.
- The most common satellites, tiny CubeSats, employ a standardized bus to reduce costs and labor.
- Satellites are made to be as light and durable as feasible due to the high expense of space launch.
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