How Much Energy Is Needed to Launch a Satellite into Orbit?

AI Thread Summary
To launch a 200 kg satellite into a circular orbit with a radius of 8.0 x 10^6 m, it's essential to consider not just the energy to reach the orbit but also the energy required to maintain it. The gravitational potential energy calculations alone are insufficient, as they do not account for the kinetic energy needed for orbital stability. The discussion highlights the importance of understanding both potential and kinetic energy in orbital mechanics. A practical approach is necessary to ensure the satellite remains in orbit after launch. Properly addressing both energy components is crucial for successful satellite deployment.
Effective
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Homework Statement



How much energy is required to launch a 200 kg satellite from the surface of the Earth into a circular orbit with radius 8.0 * 10^6 m?

G=6.67*10^-11

Homework Equations



Ep= -GMm/r

The Attempt at a Solution



I calculated the gravitational potential energy of the object on the earth, then I calculated the gravitational potential energy of the object in the circualr orbit and then I subtracted the two and apparently that's not the correct way to tackle the problem.
 
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Effective said:
How much energy is required to launch a 200 kg satellite from the surface of the Earth into a circular orbit with radius 8.0 * 10^6 m?
…
potential energy of the object on the earth, then I calculated the gravitational potential energy of the object in the circualr orbit and then I subtracted the two and apparently that's not the correct way to tackle the problem.

Hi Effective! Welcome to PF! :smile:

That will only give you enough energy to get it up there …

you need it to stay up also! :biggrin:​

… :wink: you got to be practical!​
 

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