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  1. L

    Theory of relativity - spacetravel

    I failed this question on my exam :mad: , would appreshiate someone helping me figuring out a correct answer :smile: "Suppose a person on planet X, 10 lightyears away from Earth, sends a readiomessage travelling with the speed of light. An astronomer leaves planet X in a spaceship, at the...
  2. L

    Howcome HIV doesn't spread by kissing?

    HIV is an infectous desease that spreads via sexual contact (as well as other ways). Sexual contact would mean contact between mucous membranes. Isn't the inside of the mouth a mucous membrane as well? Is it simply because there is less friction between the membranes when kissing, than during...
  3. L

    Animals versus humans

    I think chimps are able to recognize themselves in a mirror. I've read of experiments when they paint little dots say over the chimps eye, and looking in the mirror he sees the dot and touches his face where the spot is... As for animal suicides, I'm less sure of that. I have heared of...
  4. L

    Did you ever wake up and found you were unable to move?

    Yes, I think the animal does loose control of its muscles if it's experiencing tonic immobility. I also think animals more conciouly fake to be dead or injured, but then that isn't proper tonic immobility. Says a little about it on this site, under Limbic system and Tonic immobility...
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    Did you ever wake up and found you were unable to move?

    Been reading a little more about this now, didn't realize how much was written about it on the web! Anyway, in another forum I read a possible biological explination as to why sleep paralysis occurs... There's something similar going on with some animals, called Tonic Immobility, when they...
  6. L

    Did you ever wake up and found you were unable to move?

    Oh, I hate that painting (on the site you recommended) with the woman with the creature sitting on her, it seriously gives me the creeps!! Reading that site makes me realize that it's happened to me more than once, just the way it's being described, with the feeling that there's some sort of...
  7. L

    Did you ever wake up and found you were unable to move?

    That happened to me once, I was definetely awake but unable to move arms, legs, anything. It only lasted ever so briefly, but it was kind of scary. I've read that this happens to most people, but rarely. Can anyone explain to me why this happens? Does it have something to do with why you...
  8. L

    2nd (and last) probl. - threshold temperature for intermediate vector boson Z?

    Thanks Zefram, for helping me, I managed to solve it after! :smile: Linda, Sweden
  9. L

    Need some help with Doppler effect problem! Exam Monday!

    Thanks a lot for that!! Was easy to solve with your help :smile: , now lets hope I pass my exam tomorrow as well! Thanks again, Linda, Sweden
  10. L

    The wave-particle dualism applies to the photon (right?) but does it apply to

    Great, thanks for the speedy reply guys!! Linda, Sweden :smile:
  11. L

    The wave-particle dualism applies to the photon (right?) but does it apply to

    the electron, neutrine and positrone as well? Hope I'm asking this at the right place, and that my spelling was ok! Thanks for any replies!! Linda, Sweden
  12. L

    2nd (and last) probl. - threshold temperature for intermediate vector boson Z?

    Did that make any sense at all? The problem goes, and I do my best to translate from Enlish from Swedish: The mass of the intermediate vector boson Z is 97,1 times the mass of a protone, whos energy "at rest" is 938 MeV. a) Calculate the threshold temperature of Z. b) Calculate how long...
  13. L

    Need some help with Doppler effect problem! Exam Monday!

    Hi everyone, really would love it if someone could help me with this. I think it's probably a very easy problem, only I can't seem to find the right formlula, or understand the only one I found... This is the problem: I'm in my car, driving towards a crossing with a red traffic light...
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