Another TGP brain teaser thread...

Discussion in 'The Pub' started by CyberFerret, Apr 20, 2015.

  1. CyberFerret

    CyberFerret Member

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    I am enjoying some of the ones I have seen on here... Let me throw this one into the ring:

    [​IMG]
     
  2. BarkingTree

    BarkingTree Member

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  3. MrAstro

    MrAstro Member

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    = length + (4 * circumference)

    = 12 + (4 * 4)

    =12 + 16

    = 28cm

    hmmm stuffed that up. Can't be right from a common sense perspective...
     
    Last edited: Apr 20, 2015
  4. Tom CT

    Tom CT Old Supporting Member Gold Supporting Member

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  5. John Coloccia

    John Coloccia Cold Supporting Member

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    I get 20cm. It's interesting how many different ways there are to figure it out, depending on your inclinations.
     
  6. CyberFerret

    CyberFerret Member

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    GTFO and do it in Imperial units John.... :D
     
  7. John Coloccia

    John Coloccia Cold Supporting Member

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    Fine. It's about 0.0009941939075797 furlongs. See? Simple.
    :hide
     
  8. aynirar27

    aynirar27 All You Need Is Rock and Roll Gold Supporting Member

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    i'm gonna go with 20 cm, whatever that stands for. :dunno
     
  9. fish78

    fish78 Member

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    I must be losing my mind...thought I posted...28cm...16+12....maybe I am missing something.
     
  10. Turi

    Turi Member

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    It's 20cm.

    My workings are as follows:

    CTRL + T.
    A string is wound symmetrically. *hit enter*
    Scroll through a few results, see if multiple people are in agreement.
    Stumble across a book that has multiple correct and incorrect answers.
    Notice all the correct ones are 20cm.
    Therefore, answer is 20cm.


    It comes as no surprise that this quiz is from like 18 years ago, the internet loves to drag up old stuff and fob it off as new, doesn't it?
     
  11. aynirar27

    aynirar27 All You Need Is Rock and Roll Gold Supporting Member

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  12. fish78

    fish78 Member

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    OK, I think I see the 20cm answer...
     
  13. fish78

    fish78 Member

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  14. aynirar27

    aynirar27 All You Need Is Rock and Roll Gold Supporting Member

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    rod length is pretty important.
    12cm rod with 4 wraps gives you 3cm sections
     
  15. The Captain

    The Captain Supporting Member

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    I think if you tried that, you would come up short. Let me illustrate. Imagine the rod length is one metre. Now is it irrelevant ?

    I imagine there is a correct mathematical approach to account for the rod length, but it's probably easier to just wrap and measure. A few years back, the honda guys had so much trouble getting the racing authorities to understand the math that calculated the volume of the oval cylinders on the famous NR500, that they resorted to filling them with oil and measuring it, to prove teh displacement was as claimed. Worked a treat.
     
  16. Madguitrst

    Madguitrst Member

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    width = 4 x 4 = 16cm
    length = 12cm
    diagonal length = ((16^2 + 12^2))^0.5 = 20cm
     
  17. LDS22

    LDS22 Supporting Member

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    ^^^ yes yes yes. too fast. I be a dumb engineer
     
  18. 2leod

    2leod Re-Member Gold Supporting Member

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    I cut my imaginary paper towel tube into 4 smaller tubes and opened them up to 4 rectangles, 4 cm by 3 cm each. I arrange the rectangles so the string runs from one corner diagonally across each of them, revealing a right angle triangle - 3 squared by 4 squared equals 5 squared for each of the rectangles, 5 times 4 rectangles equals 20.
     
  19. CyberFerret

    CyberFerret Member

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    This is the best way of explaining it yet! :aok
     
  20. John Coloccia

    John Coloccia Cold Supporting Member

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    That's how I imagined it too because I didn't have 16^2 off the top of my head.
     

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