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    The puzzle( khaled from uk)

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    khaled

    عدد الرسائل : 133
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    تاريخ التسجيل : 25/03/2009

    The puzzle( khaled from uk)

    مُساهمة من طرف khaled في الإثنين مارس 30, 2009 2:20 am

    The Puzzle: The circumference of the Earth is approximately 40,000 kilometres, and someone has just made a metal band that circles the Earth, touching the ground at all locations.

    You come along at night, as a practical joke, and add just 10 metres to its length (one hundredth of one kilometer !)

    It is now one four-millionth longer, and sits magically just above the ground at all locations

    How far has it risen ... could a flea, a rabbit or even a man squeeze underneath it?


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    The Solution . . .
    Use the formula Circumference = 2 × pi × Radius

    Before: Original Circumference = 2 × pi × R
    After: Original Circumference + 10 = 2 × pi × (R + Gap)

    Subtracting the two:

    10 = 2 × pi × Gap

    So, the Gap = 10 / (2 × pi) = 1.6m

    So a man could fit under it easily (though he might bump his head)

      الوقت/التاريخ الآن هو الثلاثاء سبتمبر 18, 2018 4:10 pm