fun engineering quiz

Discussion in 'Just for Laughs' started by Arroryn, Dec 31, 2007.

  1. Arroryn

    Arroryn we're all dooooooomed Moderator

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    Question:

    A bear falls from a height of 20 metres and reaches the ground in exactly 2 seconds.

    What's the colour of the bear?
     
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  2. Kitkatninja
    Highly Decorated Member Award 500 Likes Award

    Kitkatninja aka me, myself & I Moderator

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    Got to be red, unless he landed in mud - then brown/red :lol:

    -Ken
     
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  3. Arroryn

    Arroryn we're all dooooooomed Moderator

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    lol. No.
     
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  4. nXPLOSi

    nXPLOSi Terabyte Poster

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    White?
     
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  5. Arroryn

    Arroryn we're all dooooooomed Moderator

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    Correct... now explain why :biggrin:blink
     
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  6. wizard

    wizard Petabyte Poster

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    Would you actually be standing round long enough to see the colour of the bear. I know that I wouldn't be. :)
     
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  7. nXPLOSi

    nXPLOSi Terabyte Poster

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    Its a polar bear...

    /runs
     
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  8. Arroryn

    Arroryn we're all dooooooomed Moderator

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    And, to quote a hair product advert... the science?
     
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  9. twizzle

    twizzle Gigabyte Poster

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    Technically Polar bears aren't white! They have translucent hair which reflects the whiteness of the surrounding snow. And thier skin is a very pale pink not white before anyone says so!
     
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  10. nXPLOSi

    nXPLOSi Terabyte Poster

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    I actually guessed and have no idea! :biggrin
     
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  11. Arroryn

    Arroryn we're all dooooooomed Moderator

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    lol... fiiiiiine. Here's the science:

    Distance = ut+1/2at^2

    u = 0

    distance = 20

    t = 2

    therefore a = 10

    This acceleration (gravitational, as the bear is falling) can only be 10 at the poles (the average being 9.81, or 9.79 at the equator).
     
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  12. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Er - I was wondering at the rather unusual implied value of g.

    According to Wikipedia it is about 9.832 at the poles. :biggrin

    Harry.
     
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  13. Arroryn

    Arroryn we're all dooooooomed Moderator

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    lol. Buggrit Harry, I'm trying to find a reference online that has the value of g at the poles as nearer 10.

    Both the engineers I work with say they have always seen it referenced closer to, if not slightly over, 10.

    So for the purpose of the joke/quiz, I have to say Wikipedia is lying :tongue
     
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  14. wizard

    wizard Petabyte Poster

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    I had a feeling that was the case :D
     
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  15. Mr.Cheeks

    Mr.Cheeks 1st ever Gold Member! Gold Member

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    Arroryn,

    Where was the fun?

    Cheeks (runs away before i get kicked in the nads!)
     
  16. Arroryn

    Arroryn we're all dooooooomed Moderator

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    Hey Cheeks,

    The words 'fun' and 'engineering', never mind 'fun' and 'quiz', are an oxymoron in themselves :tongue
     
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  17. nXPLOSi

    nXPLOSi Terabyte Poster

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    How could you tell? :twisted:
     
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  18. BosonMichael
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    Gravitational force is measured by g = G*M/d^2

    where G is the Gravitational constant, 6.67259 x 10^-11 Nm^2/kg^2,
    M is the mass of the Earth, 5.98 x 10^24 kg,
    and d is the distance from the center of the Earth.

    At sea level, d = 6.38 x 10^6 m (6380 km).
    Using this value of d gives a value of 9.8 m/s for g.

    At the poles, d = 6.357 x 10^6 m (6357 km).
    Using this value of d gives a value of 9.87 m/s for g... not 10 m/s.

    Sorry... the chemistry major/physics minor in me is comin' out. :)
     
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  19. r.h.lee

    r.h.lee Gigabyte Poster

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    BosonMichael,

    Sea level? There's a sea level at the poles too. Didn't you mean "equator?" :) Also, I recall the units for g is m/s^2.

    The former Aerospace Engineering major is coming out in me. :)
     
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  20. r.h.lee

    r.h.lee Gigabyte Poster

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    Mr. Cheeks,

    This kind of problem is fun for engineers, therefore a "fun engineering quiz." :)
     
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