The satellite and its work done

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The discussion centers on the concept of work in physics, particularly regarding artificial satellites in orbit. It emphasizes that if an object returns to its starting point, it experiences no displacement, leading to the conclusion that no work is done, regardless of the energy exerted. The conversation explores whether an artificial satellite, despite returning to its original position, can still perform tasks and utilize energy, which could be considered as work done. It highlights that if the satellite is functioning and using solar energy, it may be considered to have done work. Conversely, if it is not functioning, the work done is zero, as the gravitational force does not perform work on an object in a stable orbit. The discussion also touches on the broader definition of work, suggesting that mental work can occur independently of physical displacement.
HLAung
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If the starting and ending points are the same, there is no displacement.
If there is no displacement, no matter how much energy is exerted, work is not done.

So, is an artificial satellite orbiting the Earth with the same starting and ending points not working?

In my opinion, in such a problem, we should think about
1. Can the satellite perform its assigned task?
2. If it is functioning, the solar energy it receives, utilizes and stores while orbiting the Earth is its work done.
3. If it is orbiting without functioning, work is not done (Work done is zero.).
 
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An object in a circular orbit has constant kinetic and potential energy, so the Earth's gravitational force does no work on it.

I don't see the relevance of solar energy.
 
Define "work done".

Just because I am lying motionless in bed doesn't mean I haven't done any mental work. I could solve some pesky problem, or write a poem.
 

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