Is this Perpetual Motion Machine generating energy from nothing ?

Discussion in 'Physics & Math' started by Singularity, May 29, 2006.

  1. Singularity Banned Banned

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    Asume two large planets in elliptical orbits to each other such that they just pass by eachother without any kind of friction. ?
    There is nothing else near them to affect them in any way.

    As they pass by close to each other, both of them get streched and chruned, thus large amounts of heat is generated within them (just like in case of Jupiter moons) and they return back to their round shape as they move away in the orbits.

    so where is the energy comming from to get converted into heat ?

    I hope I havent goofed up !

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    Last edited: May 29, 2006
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  3. CANGAS Registered Senior Member

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    I have already responded in another thread. U all didnt see?
     
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  5. c7ityi_ Registered Senior Member

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    I have never seen energy come from anywhere but nothing.
     
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  7. baumgarten fuck the man Registered Senior Member

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    I didn't read the other thread, so I'll say here that it comes from gravity. These two planets will eventually spiral into each other.
     
  8. kevinalm Registered Senior Member

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    Singularity,
    The fact that heating is occurring implies that your premise is wrong. There in fact must be "friction" as you call it. In the other thread a number of causes were meantioned. The two major sources of energy in this scenario are the gravitational potential energy of the separation of the bodies and the rotational kinetic energy of the bodies.
     
  9. Singularity Banned Banned

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    No, they wont spiral into eachother.

    The orbits are fixed and unchanging.
     
  10. kevinalm Registered Senior Member

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    Hard to tell. Depends critically on orbital parameters, elastic modulus of planets, etc.

    Not if the planets are heating.
     
  11. c7ityi_ Registered Senior Member

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    But where does gravity come from?
     
  12. baumgarten fuck the man Registered Senior Member

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    Gravity comes from mass. Anything with mass exerts a gravitational pull on everything else.
     
  13. Pete It's not rocket surgery Registered Senior Member

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    If they're heating each other by tidal friction as they pass, then the orbits or the planets' rotations or both will change.

    Eventually, the planets will settle into a minimum energy state, tidally locked and in circular orbit around each other.
     
  14. James R Just this guy, you know? Staff Member

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    Not possible.
     
  15. c7ityi_ Registered Senior Member

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    Why, what is it in "mass" that causes it?
     
  16. Pete It's not rocket surgery Registered Senior Member

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    Nobody knows.
     
  17. CANGAS Registered Senior Member

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    There aint no such thing as an orbit that is fixed and unchanging.

    Not in this thread or anywhere in the real universe.
     
  18. c7ityi_ Registered Senior Member

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    You probably mean that no physicist knows. I seriously think that all energy comes from nothing.
     
  19. Pete It's not rocket surgery Registered Senior Member

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    I'm sure you do think that, and you're welcome to your opinion.

    "Nobody knows" still stands

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  20. c7ityi_ Registered Senior Member

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    Gravity is magnetism in rotation. Magnetism causes rotation and rotation causes gravity.

    You can't say nobody knows unless you know everybody.
     
  21. Nasor Valued Senior Member

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    The energy would come from gravitational potential energy. If there is no change in the orbits, then the distorting effects that you describe could not occur.
     
  22. baumgarten fuck the man Registered Senior Member

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    This is not really a question that physicists have generally asked. Physics does not represent the Truth, only a model that accurately reflects it.
     
  23. James R Just this guy, you know? Staff Member

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    Both wrong.

    When I stick a magnet on my fridge, the fridge doesn't rotate.

    An magnetism and gravity are completely separate forces.
     

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