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    John:

    I saw your friend request and tried to accept it, but it didn't seem to work.

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    John Duffield
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    Pressure of light....

    I think you'll find it here

    Solar sail - Wikipedia, the free encyclopedia
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About johnzxcv

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  1. johnzxcv
    johnzxcv liked post by tk421 On thread : God particle a threat to universe ,said Stephen Hawking
    The context is Hawking's quote. By "primitive" he means "technologically less well developed." The Aztecs thus did not fare well in their encounters with Cortes. Hawking is not making a moral...
    Liked On: 09-14-2014, 02:59 PM
  2. johnzxcv
    johnzxcv liked post by Physicist On thread : Anyone know how to prove Enstein's equation E=mc^2 ?
    This one is a very good book too: Special Relativity by A.P. French which you can download at - Special relativity | A.P. French | digital library BookOS (http://bookzz.org/book/507514/af2170) - Turn...
    Liked On: 09-07-2014, 12:22 AM
  3. johnzxcv
    johnzxcv liked post by Beer w/Straw On thread : This is a PM I got....
    Normally, I think Admins/Mods can read the entire PM box of members. With bugs in the forum software, however, I don't know if is the case. Hence, this is a PM I got from littrecro: Do you want...
    Liked On: 09-06-2014, 02:48 PM
  4. johnzxcv
    johnzxcv liked post by Farsight On thread : How can 299792458 m/s be different to 299792458 m/s ?
    It's done already and you know it, only it's called the coordinate speed of light. Note that the elapsed time t displayed by an optical clock at some elevation is directly dependent on the...
    Liked On: 09-06-2014, 02:46 PM
  5. johnzxcv
    johnzxcv liked post by tk421 On thread : Help and Ideas needed.
    There are many, many interesting and relevant experiments that may be performed without a large budget. You can use a discarded CD or DVD as a diffraction grating. That, in turn, can be used for...
    Liked On: 09-05-2014, 09:53 AM
  6. johnzxcv
    johnzxcv liked post by Physicist On thread : Help and Ideas needed.
    No. Whenever you hear someone use the term "magic" in modern life you know they're going to try to trick you using your lack of knowledge of science. I myself never heard of that thing with the...
    Liked On: 09-04-2014, 02:01 PM
  7. johnzxcv
    johnzxcv liked post by SinceYouAsked On thread : Anyone know how to prove Enstein's equation E=mc^2 ?
    Here is the derivation of energy-mass equivalence by Einstein, September 27, 1905 ... http://www.fourmilab.ch/etexts/einstein/E_mc2/e_mc2.pdf OK, so the final eqn in Einstein's famous paper is...
    Liked On: 09-04-2014, 01:57 PM
  8. johnzxcv
    johnzxcv liked post by Physicist On thread : Help and Ideas needed.
    Correct. It's not so obvious to everyone though. However its the magnitude of the melting difference that people get thrown by. Perhaps its better to use a plate which they claim is made of a special...
    Liked On: 09-04-2014, 11:42 AM
  9. johnzxcv
    johnzxcv liked post by Physicist On thread : Is Negative energy real?
    It's a rather complicated thing. The point objects in gravity are always attractive making the potential always negative. So when all the objects are the same and attract the total potential is...
    Liked On: 09-03-2014, 04:27 PM
  10. johnzxcv
    johnzxcv liked post by Physicist On thread : Anyone know how to prove Enstein's equation E=mc^2 ?
    Since Jilan and johnzxcv like this I'll do a bit better. Although the math isn't that difficult for those who know calculus its difficult to do in Latex and I'm not that good in Latex. I recall that...
    Liked On: 09-03-2014, 03:20 PM
  11. johnzxcv
    johnzxcv liked post by cincirob On thread : Is Negative energy real?
    Jilan: Do fields really have energy or do particles have energy by virtue of their position in them? Fields certainly have the ability to transfer energy but that is not the same thing as having it...
    Liked On: 09-03-2014, 03:13 PM
  12. johnzxcv
    johnzxcv liked post by Physicist On thread : Is Negative energy real?
    The potential energy of a positive charge in the field of a negative charge is negative. However the energy in the field itself is positive.
    Liked On: 09-03-2014, 03:13 PM
  13. johnzxcv
    johnzxcv liked post by Physicist On thread : Anyone know how to prove Enstein's equation E=mc^2 ?
    The problem that x0x made here is that let out all the justification as to why P = mU should be equal to (Mc, p) where M = \gamma m is the relativistic mass of the particle and p = 3-momentum. It's...
    Liked On: 09-02-2014, 03:08 PM
  14. johnzxcv
    johnzxcv liked post by Physicist On thread : Why can't we tell exactly location of a electron moving through out space but only its probability?
    John - I don't think that I really answered your question here. The answer is that you can measure exactly the location of a electron moving through space. However when you measure it you've changed...
    Liked On: 09-02-2014, 02:22 AM
  15. johnzxcv
    johnzxcv liked post by MaxPayne On thread : Does wormhole exist?
    Wormhole should exist for transferring information between entangled particles. Also Quantum tunneling is bit like a passing through a wormhole. No one knows for certain. maybe someone will come...
    Liked On: 08-31-2014, 03:48 PM
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