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Thread: Deaf Chinese Dancers and Lasers , what lasers ?

  1. #1
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    Laser Warning Deaf Chinese Dancers and Lasers , what lasers ?

    Checkout this interesting Youtube video of deaf Chinese dancers (laser effects in background).
    Here " http://www.youtube.com/watch?v=xgHmSdpjEIk "


    Enjoy

    Rick
    Profile Redacted by Admin @ 04.24.2010

  2. #2
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    Well... they sure do have numbers against us... That is very cool!

    Thanx for sharing

    --DDL
    I suffer from the Dunning–Kruger effect... daily.

  3. #3
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    Laser Warning

    Quote Originally Posted by daedal View Post
    Well... they sure do have numbers against us... That is very cool!

    Thanx for sharing

    --DDL
    Yep, 1.4 billion of em and counting.
    I recall my Physics teacher in college saying If all the people in China could jump off a chair at the same time, you would probably feel the repercussions around the world.
    Now if you put India and China together and synchronize the chair jumping using computers, well, Holy Rickter .... Don't piss them off at the same time.

    TTYL
    Rick
    Profile Redacted by Admin @ 04.24.2010

  4. #4
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    That is a crazy observation! I never though of that... Sad part is it's true...

    My thought process went more towards Newton's second law. When they want to make the jump... and they all puch on their respective chairs, there has to be a force powerful enough to lift all of these people up off the planet (I say planet, not chairs, in this case) applied. That alone could probably move earth off its orbit! God only know what the synchronized drop would do... and it can only add more destruction in this case.

    We do that enough times, at the right time, and we could probably move further away from the sun, solving our "global warming" issue!

    Yeppe, you heard it here first... We have a solution to global warming!

    But, really, how much force are we talking about here? 1.4B people, at an average weight of ~60Kg, is 84B Kg. 84Billion N?

    The crazy part is that the jump would apply about as much force as the drop itself... We're talking the equivalent of tons of thermonuclear fuel!

    --DDL
    I suffer from the Dunning–Kruger effect... daily.

  5. #5
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    Cool

    Not as much force as you might think. Seriously though - this is Urban Legend fodder. I'm surprised it ever came up in a classroom. Sorry Rick, but it sounds like your Physics teacher wasn't very good at his job.

    From Answerbag.com :
    If people weighed on average 1000 lbs, a billion people would weigh a trillion pounds. The earth "weighs" about six sextillion tons. That is more than a trillion times the weight of all the people on earth. So, if all the people on the earth jumped the same direction at the same time, the earth would move less than one trillionth as far in the opposite direction. For example, if everybody jumped two feet directly toward the north star, the earth would move less than a millionth of a millionth of a foot away from that star.

    The real kicker is that as soon as those people jump, they start falling back toward the earth and the earth falls back toward them and the net effect is immesurably close to zero. The earth running into hydrogen atoms, cosmic dust and the occasional meteor as it moves around the sun has a greater effect on its orbit than the mother of all coordinated jumps ever could.
    Note the nearly 10-fold increase in a persons weight, just to make the calculation easy. Still not enough to matter.

    Another answer mentions the tremendous weight that hits the earth each time it rains. (Oh yeah....) No change to the Earth's orbit so far, and we don't feel any repercussions from all that weight hitting the Earth either.

    Adam

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    Quote Originally Posted by buffo View Post
    Not as much force as you might think. Seriously though - this is Urban Legend fodder. I'm surprised it ever came up in a classroom. Sorry Rick, but it sounds like your Physics teacher wasn't very good at his job.

    From Answerbag.com :

    Note the nearly 10-fold increase in a persons weight, just to make the calculation easy. Still not enough to matter.

    Another answer mentions the tremendous weight that hits the earth each time it rains. (Oh yeah....) No change to the Earth's orbit so far, and we don't feel any repercussions from all that weight hitting the Earth either.

    Adam
    Good point Adam

    The real kicker is that as soon as those people jump, they start falling back toward the earth and the earth falls back toward them and the net effect is immesurably close to zero.
    I forget about this one...



    Thanx for double checking my answer

    Nevertheless, it's amazing to note the amount of power generated by simple things we don't even take into account!

    --DDL
    I suffer from the Dunning–Kruger effect... daily.

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    Quote Originally Posted by buffo View Post
    Not as much force as you might think. Seriously though - this is Urban Legend fodder. I'm surprised it ever came up in a classroom. Sorry Rick, but it sounds like your Physics teacher wasn't very good at his job.

    From Answerbag.com :

    Note the nearly 10-fold increase in a persons weight, just to make the calculation easy. Still not enough to matter.

    Another answer mentions the tremendous weight that hits the earth each time it rains. (Oh yeah....) No change to the Earth's orbit so far, and we don't feel any repercussions from all that weight hitting the Earth either.

    Adam
    Hi Adam,

    Actually, the particular Physics teacher was one of my favorites . Good old Mr. Murphy.
    I didn't take his statement too seriously ,though I have no doubt the synchronized chair jump in China could be registered on seismometers. Maybe "Myth Busters" should do a show in China to put this Urban legend fodder to sleep. I'm kidding of course.

    Take Care
    Rick
    Profile Redacted by Admin @ 04.24.2010

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