Round the earth riddle
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The circumference of the Earth is approximately 40,000 kilometers, 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 meters 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?
The circumference of a circle with radius R is 2*pi*R
We have two radius’s R1 and R2 with circumferences 2*pi*R1 and 2*pi*R2 and the difference is 2*pi*(R2-R1) = 10 m. So the elevation (R2-R1) = 10/(2*pi) = 1,59 m
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