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String girdling Earth is a mathematical puzzle with a counterintuitive solution. In a version of this puzzle, string is tightly wrapped around the equator of a perfectly spherical Earth. If the string should be raised 1 metre (3 ft 3 in) off the ground, all the way along the equator, how much longer would the string be?
String girdling Earth: Image title: Visualisation of the String girdling Earth puzzle showing that the length added to the circumference (cyan) is dependent only on the additional radius (red) and not the original circumference (black), by CMG Lee. Width: 100%: Height: 100%
Suppose the radius of the sphere is and the length of the cylinder (or the tunnel) is .. By the Pythagorean theorem, the radius of the cylinder is . Finding the measurements of the ring that is the horizontal cross-section.
In 1970, millions of Americans concerned about the environment observed the first 'Earth Day.' Forty-four years later, the tradition and message of conserving our beautiful planet is still going ...
A college student in a gas mask "smells" a magnolia blossom during the first Earth Day on April 22, 1970 in New York City. Credit - AP. M ore than 8 billion people inhabit Earth, and soon a ...
Earth Day Facts (Jessica Zaccaria / Getty Images/iStockphoto) A 2015 study estimated that there are roughly 3 trillion trees on earth, give or take a few million.
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