Today in ASL I ... (Day to day ASL doings)

Discussion in 'Advanced Squad Leader' started by Phlegm, Mar 6, 2012.

  1. Philippe D.

    Philippe D. Active Member

    884
    Jul 1, 2016
    Bordeaux
    Actually, 30 months seems not that small - it's something like 1 in 10^8 (the Earth's age is roughly 100 millions times that). I would have thought relativistic effects would be way smaller than this at this scale - meaning, even in the presence of the Earth's mass. But then, my last relativity course was in high school 30 years ago, at a time when I could barely understand the statement "at low speeds, this gives you back Newton's law".
     
  2. Justiciar

    Justiciar Well-Known Member

    Mar 2, 2008
    Within Range
    Sheldon was just bored then.
     
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  3. Jeffrey D Myers

    Jeffrey D Myers Active Member

    671
    Aug 12, 2011
    ABQ, NM, USA
    (Glad to see that someone other than my dad and I say "Good Enough for Government Work".)
     
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  4. Paul M. Weir

    Paul M. Weir Well-Known Member

    Apr 3, 2004
    Dublin
    Earth's age ~ 4 billion years = 4*10^9 Y / 2.5 Y (IE 30 months) = 1.6*10^9 times the 30 month period.

    Now that you bring it up, for special relativity the Lagrange thingy equation 1/√(1-v²/c²) is the distortion (about my SR knowledge limit also). Let's see what speed would be required for the same effect. Let D(istortion) be the ratio of the rate ticking of the moving clock compared to that of the observer's clock, v the velocity and c the speed of light.

    D = 1/√(1-v²/c²)
    D = 1/(1-1.6*10^-9) = 1/√(1-v²/c²)
    √(1-v²/c²) = 1-1.6*10^-9 = 0.9999999984
    1-v²/c² = 0.99999999680000000256
    v²/c² = 1 - 0.99999999680000000256 = 0.00000000319999999744
    v/c = 5.6568542472296384949572544786157e-5
    v ~ 16958.8 m/s or 37935.8 mph

    The escape velocity from earth is ~ 11186 m/s and v is about 1.52 times that (~ π/2 ?)

    So that figure of 30 months sees very, very plausible to me.
     
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  5. hongkongwargamer

    hongkongwargamer It ain't the Dice Silver Supporting Member

    Apr 4, 2013
    17 hexes
    Paul, you had me at “4 billion”...


     
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  6. Paul M. Weir

    Paul M. Weir Well-Known Member

    Apr 3, 2004
    Dublin
    I fairly certain that I picked up that phrase here, can't remember who, but it seemed a clever, amusing and often apt phrase.
     
  7. Philippe D.

    Philippe D. Active Member

    884
    Jul 1, 2016
    Bordeaux
    Yeah, I was off by a factor of about 10 - I read "months" and counted "years", that's about correct.

    I'm unable to check your calculations, never learned enough about relativity for this - but escape velocity on earch is pretty high compared to the speed of its surface, right? (lateral speed at the equator, compared to the earth's center, is about 40.000km per 24h, so that's what? 500m/s? (but I suppose the question is how much the presence of mass distorts time - and that's something I have no intuition of)
     
  8. Paul M. Weir

    Paul M. Weir Well-Known Member

    Apr 3, 2004
    Dublin
    4*10^4 km/day ~ 463 m/s, but either that or 500 m/s << 11186 m/s by about a factor of 24.

    I would hope that escape velocity is much, much higher, otherwise everything at the equator would drift/fly off into space, including air!

    Don't forget that escape velocity is not only enough to get you into orbit beyond the atmosphere, but if earth was the only body in a static universe, it would allow you to disappear to infinity.

    I have no more idea than you of how much mass distorts space or time, but I had a hunch that the 30 month mass induced difference would be of the same order of magnitude, at least, as escape velocity induced difference, turning out closer (1.52 x) than I expected.

    One effect is that the adjustments necessary to make GPS accurate require allowance for both earth mass and orbital velocity, the mass speeding up the satellite's clock and the velocity slowing the satellite's clock, the velocity element being the larger effect. (compared to an earth based clock)
     
  9. Ric of The LBC

    Ric of The LBC New Member

    21
    Oct 22, 2017
    But what is the airspeed velocity of an unladen swallow?
     
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  10. Paul M. Weir

    Paul M. Weir Well-Known Member

    Apr 3, 2004
    Dublin
    African or European swallow?
     
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  11. Ric of The LBC

    Ric of The LBC New Member

    21
    Oct 22, 2017
    Well, I don't know?

    AAAHHHHHHHHHHHH

    BRidge.jpg
     
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  12. thedrake

    thedrake Active Member

    Feb 2, 2003
    Slidell,Louisiana
    Started playing Acts of Defiance today.
     
  13. Yuri0352

    Yuri0352 Active Member Silver Supporting Member

    Nov 21, 2014
    25-30 Hexes
    I've been relaxing by solo playing the two-part PTO scenario OB9 Unhappy Trails. I would highly recommend this scenario as an introduction to the PTO for the newer players. Could easily be played during an evening by experienced players as well.
     
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  14. von Marwitz

    von Marwitz Well-Known Member

    Nov 25, 2010
    Kraut Corner
    I just knew it would just be a matter of time until this happened. Gotta love this forum... :D

    von Marwitz
     
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  15. Roy

    Roy Living in Brownbackistan

    Oct 1, 2003
    Wichita
    Don't be silly. It's 6,000 years. Just ask any government official (or state school board members) here in Kansas.

    (Edit) to make this post thread worthy, I selected my ten favorite scenarios today.
     
    Last edited: Nov 11, 2017
  16. Over the weekend I've finally re-sorted my utility counters into a third box.
    The counters were getting too congested.
    Also cut up some cork gasket material to make bricks/debris for modeling projects, all while listening to Two Half Squads episodes.
     
  17. Thunderchief

    Thunderchief Active Member

    934
    Oct 16, 2003
    Sydney, Australia
    And what are they?
     
  18. hongkongwargamer

    hongkongwargamer It ain't the Dice Silver Supporting Member

    Apr 4, 2013
    17 hexes
  19. Jeff Waldon

    Jeff Waldon Active Member

    322
    Feb 2, 2003
    South Carolina
    Do the dice jump out of the tray? That has always been my biggest issue with dice towers.
     
  20. hongkongwargamer

    hongkongwargamer It ain't the Dice Silver Supporting Member

    Apr 4, 2013
    17 hexes
    I just got it dude. The sides look deep enough though.
     
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