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  1. M

    Charged particle、neutral particle will hit the ground simultaneously?

    If we drop a charged particle and a neutral particle at the same time(same hight) in a uniform gravitaional field, they will hit the ground simultaneously? on one hand:a freely falling charged particle will radiate according to a supported observer, so the radiation recoil (radiation...
  2. M

    Electron orbital the earth will radiate?

    If an electron orbital the earth only influence by gravity,does it emit electromagnetic waves? if so, the radius will decay,eventually falling on earth?
  3. M

    Why dark matter can not collapse into a blackhole?

    Why dark matter can not collapse into a blackhole under it's own weight?
  4. M

    Why positive or negtive pole of battery can not attract small objects ?

    why positive or negtive polar of battery can not attract small objects ?
  5. M

    Changes spotted in fundamental(α)constant

    Changes spotted in fundamental constant Sep 2, 2010 Billions of years ago the strength of the electromagnetic interaction was different at opposite ends of universe. That's the surprising conclusion of a group of physicists in Australia, who have studied light from ancient quasars. The...
  6. M

    Gravitaional field can store mass?

    Gravitational field can store mass? If i separate two rocks,the total weight of them will increase? If so,the extra mass stored in the gravitational field between them?
  7. M

    Gravity is an entropic force?

    Gravity is an entropic force?? Erik Verlinde does not consider gravity as fundamental force .Gravity is an entropic force. http://arxiv.org/PS_cache/arxiv/pdf/1001/1001.0785v1.pdf
  8. M

    Black hole can regard as most efficency mass-energy convecter?

    Black hole can regard as most efficency mass-energy converter? With blackhole and hawking radiation's help, i come up with an idea to convert my apple completely into pure energy without another antimatter apple:biggrin: I throw my apple into a blackhole , eventually my apple will convert...
  9. M

    Why Hawking radiation contains other particles besides photon?

    Hawking radiation is standard thermal spectrum, thermal spectrum means it only can emit photon. why Hawking radiation contains other particles?(electron neutrino neutron proton etc)
  10. M

    Mirage is refraction phenomenon or total internal reflection phenomenon?

    “mirage” is refraction phenomenon or total internal reflection phenomenon? “mirage” is refraction phenomenon or total internal reflection phenomenon?
  11. M

    Neutron star collapse can produce GBBs?

    If a neutron star accumulate materials from its companion star ,then it's mass exceeded Tolman–Oppenheimer–Volkoff limit, it will collapse into a blackhole! My question is ,in this case ,it will produce "gamma-ray burst"?
  12. M

    Can nuclear weapons explosion produce neutrino pluse ?

    Can nuclear weapons explosion produce "neutrino pluse"? Can nuclear weapons explosion produce "neutrino pluse"?
  13. M

    How can produce dineutron?

    I am reading wikipedia term"dineutron" but i can not understand this sentence in red. http://en.wikipedia.org/wiki/Dineutron helion=He-3 what is the reaction formula ? Thank you!
  14. M

    Light-water reactor and plutonium produce !

    In principle, light-water reactor can also produce plutonium from uranium-238 as heavy-water reactor .Plutonium can be used to make nuclear-weapon! But,Why do we like to offer this kind of power plant to other nations?
  15. M

    Betelgeuse will go supernova??

    A recent study indicates that Betelgeuse has decreased in size by 15% since 1993. http://esciencenews.com/articles/2009/06/09/red.giant.star.betelgeuse.mysteriously.shrinking
  16. M

    Why strong interaction is short-range force?

    Gluon is massless particle ,why strong interaction is short-range force?
  17. M

    Weak and strong interaction are attactive or repulsive force?

    As we know:Gravitation is attractive force, electric force is attractive and repulsive force. Weak and strong interaction are attractive or repulsive force?
  18. M

    Can general relativity derive from superstring theory?

    Can general relativity derive from superstring theory?
  19. M

    What is negative heat capacity ?

    what is" negative heat capacity"? what is "negative heat capacity"? what is the example of it?
  20. M

    What is virtual energy level ?

    What is "virtual energy level"? What is "virtual energy level"?
  21. M

    What is the percentage of heavy element of the sun?

    what is the percentage of heavy element (heavier than helium) of the sun? (not the photospheric composition)
  22. M

    Why LHC use proton-proton collide instead of proton-antiproton collide?

    Why LHC use proton-proton collide instead of proton-antiproton(like,Tevatron) collide?
  23. M

    Gun is a kind of heat engine?

    Gun is a kind of heat engine? if so ,the efficiency of a gun is limited by carnot heat engine?
  24. M

    Suppose the gravitation has very very tiny deviation from inverse square law……

    If the gravitation has very very tiny deviation from inverse square law!our solar system became unstable? If so ,how long people on the earth can notice it? Thank you in advance!
  25. M

    If the gravitation has very very tiny deviation from inverse square law!

    If the gravitation has very very tiny deviation from inverse square law!our solar system became unstable? If so ,how long people on the earth can notice it?
  26. M

    How does the induction cooker work?why aluminium pot does not work ?

    How does the induction cooker work?why aluminium pot does not work? Thank you in advance
  27. M

    Does nuclear weapon can destory the moon?

    My friends and I are talking about this question.From the point of my view,I do not think that man-made nuclear weapons can destory the moon! But one of my friends insist that man-made nuclear weapons can do that job!what is your opinion...
  28. M

    Why black holes can have static electric fields?

    Why black holes can have static electric fields??? The gravitation of black hole is so strong that nothing can escape from it ! Why black holes can have static electric fields around with it??? Thank you in advance!
  29. M

    Why objects at lagrangian points 4 and 5 are stable?

    why objects at lagrangian points 4 and 5 are stable? Thank you in advance!
  30. M

    LHC to skip low-energy test runs

    The Large Hadron Collider will not be ready in time to perform a low-energy "engineering run", which was originally scheduled to take place this November, according to an official at CERN. This will leave the operators no chance to gain experience with the particle accelerator's steering and...
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