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A surprising little calculation

  1. Jun 12, 2003 #1

    Ivan Seeking

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    I ran across this years ago and thought to pass it along. I kept the non-math types at the local museum of science and industry quite busy with this for awhile on day. Before the day was over, I had them eyeing the round dome of the science building.

    Ignoring all practical considerations, if I wrap a string around the earth at the equator and pull if tight, and then I add 1 foot to the length of the string, what is the gap formed between the string and the earth if the gap is made uniform everywhere?

    How about if we wrap a string around a 12" diameter globe and do the same thing?

    What is the radius of a circle having a circumference of 1 foot?

    A little surprising isn't it.
  2. jcsd
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