Welcome guest, is this your first visit? Create Account now to join.
  • Login:

Welcome to the Online Debate Network.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

Results 1 to 7 of 7
  1. #1
    Registered User
    Join Date
    Apr 2005
    Location
    A lake
    Posts
    346
    Post Thanks / Like

    A little puzzle...

    Imagine the earth is perfectly round and I lie a piece of rope on the ground all the way round the earth. Then the rope is lifted so it's 1 metre above the ground all the way around. How much longer would the rope have to be to meet up again?

    To get the effect of this take a guess and post your estimate before you work anything out.
    - Quack

  2. #2
    ODN Community Regular

    Join Date
    Mar 2004
    Location
    Grinnell, IA
    Posts
    4,460
    Post Thanks / Like

    Re: A little puzzle...

    EDIT: I included spoiler tags if anyone else wants to try and figure this out.
    l i= 2πr

    lf = 2π(r+1m)

    lf - l i= 2π(1m) = 2π(m) ≈ 6.28 m

    The answer would be the same no matter what the size of the sphere is.
    Last edited by Meng Bomin; July 15th, 2005 at 01:08 PM.
    孟柏民
    Formerly Neverending (for all you old-timers)

  3. #3
    Registered User

    Join Date
    Feb 2004
    Posts
    9,470
    Post Thanks / Like

    Re: A little puzzle...

    The average diameter of Earth is 12,742 kilometers. That is really all I can contribute to this thread, sadly.

  4. #4
    Registered User

    Join Date
    Mar 2005
    Location
    In the moment
    Posts
    2,347
    Post Thanks / Like

    Re: A little puzzle...

    for those of us unable to bring ourselves to do theoretical math:


    12,742 x 3.1416 = 40030.2672 Circumference of the Earth

    12,744 x 3.1416 = 40036.5504 Circumference of the Earth plus two meters (1 each side)

    40036.5504 40030.2672 = 6.2832 Difference between the two answers


    Thanks to KB for the assist. I didn't have to google to find the diameter.
    I've been meek for a whole day now...

    The world is mine!!


    The power of oui.

    impssible

  5. #5
    ODN Community Regular

    Join Date
    Mar 2004
    Location
    Grinnell, IA
    Posts
    4,460
    Post Thanks / Like

    Re: A little puzzle...

    Quote Originally Posted by PV
    Thanks to KB for the assist. I didn't have to google to find the diameter.
    You know,
    you didn't need to know the diameter. the answer will be 2 times pi no matter how big (or small)
    孟柏民
    Formerly Neverending (for all you old-timers)

  6. #6
    Registered User

    Join Date
    Mar 2005
    Location
    In the moment
    Posts
    2,347
    Post Thanks / Like

    Re: A little puzzle...

    Quote Originally Posted by Neverending
    You know,
    you didn't need to know the diameter. the answer will be 2 times pi no matter how big (or small)
    Yep. You got that one. I was just trying to make KB feel useful.
    I've been meek for a whole day now...

    The world is mine!!


    The power of oui.

    impssible

  7. #7
    ODN Community Regular

    Join Date
    Mar 2004
    Location
    Sheffield, S.Yorks., UK
    Posts
    8,862
    Post Thanks / Like

    Re: A little puzzle...

    Quote Originally Posted by KevinBrowning
    The average diameter of Earth is 12,742 kilometers. That is really all I can contribute to this thread, sadly.
    That is some mean tape measure ;?

    ps. Seeing as God is a Yorkshireman He does all His measuring in Miles, furlongs, chains, yards, feet and inches!
    "We don't see things as they are, we see them as we are." - Anais Nin.
    Emitte lucem et veritatem - Send out light and truth.
    'Fere libenter homines id quod volunt credunt' - Julius Caesar (rough translation, 'Men will think what they want to think')
    Kill my boss? Do I dare live out the American dream? - Homer Simpson.

 

 

Similar Threads

  1. Name that Puzzle!
    By Mr. Hyde in forum Logical Riddles & Puzzles
    Replies: 2
    Last Post: May 6th, 2005, 06:31 PM
  2. Pattern Puzzle
    By LokiDR in forum Logical Riddles & Puzzles
    Replies: 13
    Last Post: May 6th, 2005, 05:18 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •