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  1. U

    What does the electric field of a spherical wave look like?

    Isn't a spherically symmetric transverse wave inconsistent with the "hairy ball" theorem that has been mentioned here?
  2. U

    What does the electric field of a spherical wave look like?

    I've never heard of that theorem (just looked it up in Wikipedia), but that's basically what I was thinking, that you can't have a truly spherically symmetric EM wave. It seems that even the magnitude of the electric field vectors can't be completely spherically symmetric? So I guess it varies...
  3. U

    What does the electric field of a spherical wave look like?

    What does the electric field of a "spherical wave" look like? You often hear about spherical light waves. For example, something like a light bulb is said to emit waves which are more or less spherical. Lets assume this light bulb is perfectrly round and emits in all directions (as opposed to a...
  4. U

    Does a UNIFORMLY accelerating charge radiate? What about radiation reaction force?

    It is often stated that ANY accelerating charge radiates, so this includes uniformly accelerating charges. But the radiation reaction force is proportional to the THIRD derivative of x, so it vanishes when acceleration is constant. What's the deal here? Here's a graph which supposedly shows...
  5. U

    Twiggy the Water Skiing Squirrel - OH REALLY?

    :biggrin: I'm just saying, I'm not very impressed with this cheap trick. There are many impressive tricks various animals can do, but I don't think this is one of them.
  6. U

    Twiggy the Water Skiing Squirrel - OH REALLY?

    Twiggy the Water Skiing Squirrel - OH REALLY??? Ok, you've probably seen this, the squirrel which, supposedly, water skis. But to me, it looks like the damn thing is simply riding in a boat (made to look like a pair of water skis) which is being pulled by another boat. I find it annoying that...
  7. U

    Biological legs vs Cheetah prosthetic legs - wich is better for running?

    Um, and how many parking lots have STAIRS? Parking spots for the "disabled" are merely closer to the entrance than the other ones, but it's not like if you park somewhere else you have to go down an extra flight of stairs. And I think if you add spikes to that thing it would be better for...
  8. U

    Biological legs vs Cheetah prosthetic legs - wich is better for running?

    I don't disagree with you about the possibility that prosthetics do provide an advantage for maintaining speed (although certainly not for accelerating, to accelerate quickly with prosthetics, they would need a built in power source). However, you do have to consider that all other double...
  9. U

    Biological legs vs Cheetah prosthetic legs - wich is better for running?

    I'm sure (or hope, anyway) people know that the ankle is operated by the calf muscle. Here are some links, you can find more by googling "Oscar Pistorius": http://sport.independent.co.uk/olympics/article2377707.ece [Broken] http://www.wired.com/wired/archive/15.03/blade.html...
  10. U

    Biological legs vs Cheetah prosthetic legs - wich is better for running?

    Biological legs vs Cheetah prosthetic legs - which is better for running? EDIT: I misspelled "which" in the subject line, how embarrassing. You may have heard of Oscar Pistorius, a double below-knee amputee from South Africa who recently won the silver medal in the 400m at the South African...
  11. U

    I'm wondering, how many people would have a problem dating someone like this?

    It would've been better if she had been concerned about moving conveyor belts though...
  12. U

    I'm wondering, how many people would have a problem dating someone like this?

    The last time I checked, most students were getting more like $6/hour, not $24.
  13. U

    I'm wondering, how many people would have a problem dating someone like this?

    But check this out: Can you imagine getting paid $24 an hour for pushing paper around with a broom (which is what she did, according to another article)? Well, that's sweet, guess she had a loving father. Why wasn't she making pancakes for him though?
  14. U

    I'm wondering, how many people would have a problem dating someone like this?

    LOL! As I read her story, I noticed that she mentioned her parents, her friends, her co-workers, but she never ever mentioned how her boyfriend reacted to the accident! At first, I thought maybe she had a girlfriend instead of a boyfriend, but then I read another article about her, which said...
  15. U

    I'm wondering, how many people would have a problem dating someone like this?

    Yeah... I find her statements to be pretty shocking actually. I just can't wrap my mind around the fact that a (presumably non-retarded) 21-year-old would say such things. I remember when I was 12 I already knew very well that I had to look out for myself, I didn't even trust close relatives to...
  16. U

    I'm wondering, how many people would have a problem dating someone like this?

    Here are some of the things that she either said (I'm paraphrasing, since I don't remember the exact wording, but the meaning remains exactly the same) or that were written about her (emphasis mine): Candace had NO IDEA she could get hurt at her summer job (she was working at a damn FACTORY...
  17. U

    I'm wondering, how many people would have a problem dating someone like this?

    Yes, the prosthetic used in the photo is an athletic prosthetic, probably not something most people would wear all the time. She also has a very realistic looking prosthetic which she wears. From WHERE? Is this supposed to be a joke or something? Since when is thinking that it's completely...
  18. U

    News Story: Twin Paradox Solved

    I don't get it, why make a fool of yourself? What does electrical engineering have to do with relativity anyway???!!
  19. U

    The smartest man in universe believes in Intelligent Design

    jeez, the camera work is annoying...
  20. U

    Electric dipole charges/Electric Field

    Well, at point x the positive charge on the right creates a field kq/(x-a)^2, this field is directed in the right direction. The negative charge creates a field of magnitude kq/(x+a)^2, and this field is pointed to the left. To get the net field, subtract the field created by negative charge...
  21. U

    A man and his pet crocodile

    I just don't think what he's doing is very smart. I won't be surprised if he ends up much worse off than the girl in my previous post. I've already seen some clip of a guy putting his arm in a croc's mouth, it didn't go too well for him...
  22. U

    I'm wondering, how many people would have a problem dating someone like this?

    This is basically just a survey, I'm not trying to make fun of anyone here. I've done these surveys on some other forums, and I'm wondering whether the results will be about the same here. If this is considered an innappropriate question here, please forgive me...
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