Airship Rotating Earth: Can it be Done?

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Discussion Overview

The discussion revolves around the feasibility of an airship rotating the Earth, particularly considering the conditions under which this could occur, such as the Earth's orbital focus and the airship's power capabilities. The scope includes theoretical exploration and mathematical reasoning related to energy and orbital mechanics.

Discussion Character

  • Exploratory
  • Mathematical reasoning

Main Points Raised

  • One participant questions whether an airship can rotate the Earth if the Earth is not in an elliptical orbit's focus, suggesting the possibility of a circular orbit with the Earth at the center.
  • Another participant argues that if the airship is not powered, it cannot rotate the Earth, but if it has power for flight path corrections, it could theoretically alter the orbit shape within physical limits.
  • A third participant presents a mathematical formulation involving mechanical energy, kinetic energy, and gravitational potential energy, although the details are complex and not fully clarified.
  • A later reply indicates a participant's acknowledgment of an error in their previous mathematical contribution.

Areas of Agreement / Disagreement

Participants express differing views on the capabilities of the airship regarding the rotation of the Earth, with no consensus reached on the feasibility or the implications of the mathematical claims presented.

Contextual Notes

The discussion includes unresolved mathematical steps and assumptions regarding the energy equations and the conditions under which the airship operates.

menager31
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Can an airship rotate the Earth and the Earth is not in eliptical orbit's focus ?(can be in center?)
 
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menager31 said:
Can an airship rotate the Earth and the Earth is not in eliptical orbit's focus ?(can be in center?)

If the airship is not powered, no, with the exception that a circular orbit will have the Earth at the center.

If the airship has some power to make flight path corrections, it could do anything it wants as far as the shape of the orbit, within physical limits.
 
ok so, I read that mechanical energy(E): E=-MmG/R
R=(a+b)/2
a-semi-major axis
b-semi-minor axis
,of course kinetical Ek=mv^2/2
m-spaceship weight
Ep=-mMG/r
v^2/2-MG/r=-2MG/(a+b)
and
a-sqrt(a^2-b^2)=<r=<a+sqrt(a^2-b^2)
and v^2 for some r is less than 0
M>>m
 
any comments?
 
no,no delete this i made an error
 

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