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Momentum Principle and Energy Principle to find speed and energy

  • #1
The problem states:
You will need to use the Momentum Principle to do the first part of this problem, and the Energy Principle to do the second part.

A satellite of mass 4500 kg orbits the Earth in a circular orbit of radius of 9.2x10^6 m (this is above the Earth's atmosphere).The mass of the Earth is 6.0x10^24 kg.
What is the speed of the satellite?

What is the minimum amount of energy required to move the satellite from this orbit to a location very far away from the Earth?


I'm not really sure what to do here, I feel as though I need more information to work this. Help is much appreciated.
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
10
Start all satellite questions by saying that the centripetal force is provided by the gravitational force:
Fc = Fg
Fill in the detailed formula for each of those. Solve for what you are looking for and put in the numbers.
 

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