Change in energy in orbiting satellite.

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Homework Help Overview

The problem involves a satellite of mass 45.5 kg transitioning between two orbits around the Earth, specifically from an orbit of 7271 km to one of 7356 km. The question asks for the work done by all forces acting on the satellite during this transition.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss calculating total energies in both orbits using the gravitational potential energy formula. There is a consideration of whether the difference in these energies represents the total work done. Some participants question if the question might be a 'trick' and explore the implications of this interpretation.

Discussion Status

The discussion is ongoing, with participants sharing their calculations and interpretations. There is a recognition of the need to consider both potential and kinetic energies in the context of conservation of energy. However, no consensus has been reached regarding the interpretation of the question or the approach to finding the work done.

Contextual Notes

Participants note potential ambiguities in the wording of the question, particularly regarding the nature of the orbits and the forces involved. There is an acknowledgment of the possibility that the question may not be straightforward.

Gianf
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Homework Statement


A satellite of mass 45.5 kg orbiting the Earth moves from an orbit of 7271 km to an orbit of 7356 km.
what is the work done by all forces acting on it?


Homework Equations


U=GMm/r


The Attempt at a Solution


I calculated the total energies of the satellite in both orbits which is -1/2GMm/r
This gave -1.2458Gj for the lower orbit and -1.2315 for the higher one.
Should the difference be the total work done?
 
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Gianf said:

Homework Statement


A satellite of mass 45.5 kg orbiting the Earth moves from an orbit of 7271 km to an orbit of 7356 km.
what is the work done by all forces acting on it?


Homework Equations


U=GMm/r


The Attempt at a Solution


I calculated the total energies of the satellite in both orbits which is -1/2GMm/r
This gave -1.2458Gj for the lower orbit and -1.2315 for the higher one.
Should the difference be the total work done?

It says find the work done by all the forces acting on it.

Contemplate the possibility that this is a 'trick' question.
 
I've been thinking about this question all day... still don't get it
what would the trick be?
 
Sorry, I think I misread the question. Actually, it's a bit misty. My reading of it now is that there was a circular orbit of 7272 km which gets moved to a NEW circular orbit of 7356 km.

Just use conservation of energy but remember to include potential and kinetic energies.
 

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