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Thread: The Official Cricketweb Science Thread!

  1. #616
    International Captain cover drive man's Avatar
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    Quote Originally Posted by silentstriker View Post
    International System of Units
    Quote Originally Posted by nightprowler10 View Post
    Sports Illustrated.
    , Thanks ss.
    Everyone wants to change the world, noone wants to change himself.

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  2. #617
    International 12th Man Quaggas's Avatar
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    Quote Originally Posted by cover drive man View Post
    E=MC2

    What are the exact mathematical values for these say for instance I wanted to convert 1 milligram of helium into energy, what would be the exact numbers to use. Basically what proportion or numbers do I use (and please don't say you multiply it by the speed of light squared )
    The simplest solution is to use units in which c=1, so the silly answer is 1mg. You might not get full credit, though, since no one mixes MKS and particle physics units.

    Or, as an alternate to SS's elegant and more accurate solution is: 1mg of He4 corresponds to about 1.5E+20 molecules (=6/4*10^(23-3)), each of which weighs about 4GeV/c^2. So the answer is 6E+20GeV, which is also roughly 1mg in units where c=1.


  3. #618
    The Wheel is Forever silentstriker's Avatar
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    Haha natural unit nonsense FTW. Or in other words: how to come up with circular self-referential answers.

    Plus, very few units are really all that 'natural'. It's probably better to come up with a relatively arbitrary scale, which increases and decreases logically (as SI system) instead of having WTF moments later on when the 'natural' unit is found to not really exist, or even more confusingly, if it turns out to be a different value.

    SI is more than fine IMO.
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  4. #619
    The Wheel is Forever silentstriker's Avatar
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    Although anything is better than pound-furlongs (instead of Newton-meters) system of units that one Physics professor used in his exams. I think it was just to get us annoyed enough never to use anything but the SI system ever again.


  5. #620
    International 12th Man Quaggas's Avatar
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    Quote Originally Posted by silentstriker View Post
    Haha natural unit nonsense FTW. Or in other words: how to come up with circular self-referential answers.

    Plus, very few units are really all that 'natural'. It's probably better to come up with a relatively arbitrary scale, which increases and decreases logically (as SI system) instead of having WTF moments later on when the 'natural' unit is found to not really exist, or even more confusingly, if it turns out to be a different value.

    SI is more than fine IMO.
    Haha, true, but the original question is fundamentally about changing units, so it's circular too.

    c=1 is common because it brings out the energy mass equivalence and simplifies things a lot; certainly no one uses the full MKS in particle physics. Imagine carrying around "c" in a one page equation....

    Also, re the second answer, GeV is a perfectly good energy unit, given there is no context (10^21GeV vs 10^11J) - perhaps I originally wanted to compare He, say, to the max root-s for Au on Au at RHIC? Of course you're not gonna use He4 to make way for the swimming pool in the back yard, at 8MeV binding energy.

    Edit: Of course 0.1TJ does sound better than 1,000,000 YeV!
    Last edited by Quaggas; 25-07-2010 at 11:20 AM.

  6. #621
    The Wheel is Forever silentstriker's Avatar
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    GeV is fine. Plus, you do need a few competing units, just to piss off high school students. And to crash NASA probes from time to time.

  7. #622
    Cricket Web: All-Time Legend Uppercut's Avatar
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    You can tell people who are bad at science by the fact that they always ask why we ever needed to change from good ol' pounds and ounces.
    Quote Originally Posted by zaremba View Post
    The Filth have comfortably the better bowling. But the Gash have the batting. Might be quite good to watch.

  8. #623
    The Wheel is Forever silentstriker's Avatar
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  9. #624
    Cricket Web: All-Time Legend Top_Cat's Avatar
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    The Colourphonics

    Bandcamp
    Twitderp

  10. #625
    International 12th Man blahblahblah's Avatar
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    yup seen that long back

    a quite innovative concept by the team

  11. #626
    International 12th Man blahblahblah's Avatar
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  12. #627
    Global Moderator Spark's Avatar
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    Quote Originally Posted by Top_Cat View Post
    A lot of that is fairly spot on.
    + time's fickle card game ~ with you and i +


    get ready for a broken ****in' arm

  13. #628
    The Wheel is Forever silentstriker's Avatar
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    Haha loving the swipes at Collins.

    On the other hand, it's barely been ten years - obviously there hasn't been any medical benefits. Give it some time FFS.

  14. #629
    Cricket Web: All-Time Legend Top_Cat's Avatar
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    Two words; cold fusion.

  15. #630
    The Wheel is Forever silentstriker's Avatar
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    I don't think there are any parallels.

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