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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?
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.
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%
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Later additions to the group were Tamarack Farm (a work camp for 15- to 17-year-olds of all genders), Saltash Mountain (co-ed, focused on hiking trips), Flying Cloud (for 11- to 14-year-old boys, originally borrowing the traditions of the Lakota people but later creating their own system of wilderness living in the manner of cultures from ...
John McConnell was born on March 22, 1915, in Davis City, Iowa, United States.He was the son of a Pentecostal preacher [9] and traveling doctor. [6] His first interest in the Earth began in 1939 while partnering with Albert Nobell, a chemist, in the Nobell Research Laboratory in Los Angeles that built a factory for the manufacture of plastics. [6]
Incarnation's two day camps include Pequot Sherwood Day Camp and Bushy Hill Day Camp. Campers for both programs range in age from 4–15 years old. Through traditional camp activities and nature exploration, children gain leadership, teamwork and independence skills. Both day camp programs offer counselor in training programs.
The official logo of the Earth Day 20 International Peace Climb. The Earth Day 20 International Peace Climb was an expedition to reach the summit of Mount Everest during Earth Week 1990 led by Jim Whittaker, the first American to climb Mount Everest (in 1963), envisioned by Warren Thompson, and marked the first time in history that mountaineers from the United States, Soviet Union and China ...