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    Bending a laser beam ?

    Oh my! You know how many jilions of different thought have been at the top of my head? I thought of anything except this one, the most obvious thing. Thanks God. I didn't go to library in order to research about "Bending Laser Beams". :D Thank you very much. You saved me a great deal of time.
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    Bending a laser beam ?

    Bending a laser beam ?!!! I was surfing the web when I encountered this photo: http://www.ieav.cta.br/soldagem/LASER%20verde.gif [Broken] I can only read English and Persian, unfortunately the page was in another language I can't get even a word of it. Anyway I'm badly interested to know...
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    Problem figuring out the reflection of a pulse on a rope

    Maybe more :D Thank you, both the animation and discription (Newton's third law) at the page were what I needed to understand it.
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    Problem figuring out the reflection of a pulse on a rope

    I have problem figuring out the reflection of a pulse on a rope with a fixed point. Do you know some websites to find animations about it?
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    The effect of acceleration on our body

    I asked "WHY" we enjoy it.
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    The effect of acceleration on our body

    Why does it feel good when we exprience an acceleration or a change in acceleration ? (Have you ever used seasaws? :biggrin: )
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    Physics Napster

    http://www.malonus.com/books/ebooks/ [Broken] :biggrin:
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    Red light

    Why the stop lights at the back of cars are red ? Some say because red light is visible from far distances. If that's true, is any relation between this property of red light and its wave length ?
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    What is Spintronic? What effects will it have on our lives?

    Spintronic What is that ? What effects will it have on our lives?
  10. O

    Space time

    I don't care whether it is an event or an example of space time. :smile: Because it is exactly what I meant. I don't know how GZA always gives me exactly the right thing. Anyway, Pete, thank you very much.
  11. O

    Space time

    Yes. Thank you.
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    Space time

    Can you give me some examples ? Thanks
  13. O

    Space time

    Can anyone explain 4D space-time in a simple form ? Some say the Hawking's expalanation is the simplest but I don't get it :biggrin:
  14. O

    Why thunderbolts don't travel in straight lines

    What sporff told was exactly the answer I was looking for. But now with the last post some more questions are made in my mind which I just ignore them untill the time that I know more of the subject :redface:
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    Why thunderbolts don't travel in straight lines

    Last night the thunderbolt waked me up, right then this question appeared in my mind. For such an immediate question this answer is very good and complete. Thank you
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    Why thunderbolts don't travel in straight lines

    Why thunderbolts don't travel in straight lines ? I think the electrical charge likes to move in the shortest path to the earth and the shortest path must be a straight line !!!
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    Problem solving

    When you were at school there wasn't any PhysicsForums.com ? :biggrin: I found it today : ftp://ftp.ncsu.edu/pub/ncsu/beichner/RB/GOALPaper.pdf Thanks
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    Problem solving

    It is wroth mentioning here that the reason I started to search for a strait way for problem solving is the following problem : Suppose you fire a rifle bullet (1600 m/s) in a shooting gallery and hear the gong on the target ring 0.731 s later. Taking the speed of sound to be 330 m/s and...
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    Problem solving

    I have no specific problem that I can't solve !! I generally when face a physics problem don't really know what to do :) Because I'm reading physics on my own and there is no instructor I am looking for a website to learn from , how to solve physics problem :smile: .
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    Problem solving

    Do you know some websites that I can learn to solve physics problem ? I know the concepts well but when I start to solve the problems, mess up :cry: I searched for this in google but I found just some suggestions on problem solving and not a complete and clear way.
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