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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 ?

    Because the positive pole accumulate positive charges, it should attract small objects as the charged rubber rod do ?
  5. 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 ?
  6. 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...
  7. 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?
  8. 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
  9. M

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

    Here is an article talking about "Black Hole Drive Could Power Future Starships" http://www.universetoday.com/2009/11/19/black-hole-drive-could-power-future-starships/ http://arxiv.org/abs/0908.1803v1
  10. 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...
  11. M

    Why Hawking radiation contains other particles besides photon?

    It is seems that i had narrow sense about "thermal radiation". Thank you my friends^_^
  12. 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)
  13. 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?
  14. 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"?
  15. M

    Can nuclear weapons explosion produce neutrino pluse ?

    As we know,during ''core-collapse supernova"explosion, the hot temprature can produce numerous neutrinos and antineutrinos .During SN1987a, here we on earth detected them. During the nuclear explosion, the temprature is very very hot in the explosion center,if the temprature is hot enough to...
  16. M

    Can nuclear weapons explosion produce neutrino pluse ?

    Thank you "Astronuc"^_^ "Hydrogen Bomb" explosion can produce "neutrino pluse" ?
  17. M

    Can nuclear weapons explosion produce neutrino pluse ?

    Can nuclear weapons explosion produce "neutrino pluse"? Can nuclear weapons explosion produce "neutrino pluse"?
  18. 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!
  19. 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?
  20. M

    Betelgeuse will go supernova??

    Unveiling the true face of Betelgeuse DR EMILY BALDWIN ASTRONOMY NOW Posted: July 29, 2009 http://www.astronomynow.com/news/n0907/29betel/
  21. 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
  22. M

    Why strong interaction is short-range force?

    Gluon is massless particle ,why strong interaction is short-range force?
  23. 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?
  24. M

    Can general relativity derive from superstring theory?

    In weak gravitational field , Newton's universal law of gravitation can derive from GR! Under some conditions ,Can general relativity derive from superstring theory ?
  25. M

    Can general relativity derive from superstring theory?

    Can general relativity derive from superstring theory?
  26. M

    What is negative heat capacity ?

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

    What is virtual energy level ?

    What is "virtual energy level"? What is "virtual energy level"?
  28. 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)
  29. M

    Gun is a kind of heat engine?

    Thank you Lojzek, i agree with you ! From this point of view, i think the "rocket engine "does not obey Carnot's theorem too.
  30. M

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

    What is the advantages use proton-antiproton than proton-proton collision?
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