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It has taken just a little longer than the 9.58 seconds it took Usain Bolt to break the 100m world record, but scientists have finally worked out how much power the Jamaican needed to take gold at the athletics World Championships four years ago.Bolt’s time in Berlin has yet to be beaten and any athlete who wants to do so will have to have a power output on the track of almost twice a Tour de France cyclist in the closing stages of a sprint.A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings.Each ring marks a complete cycle of seasons, or one year, in the tree's life.In 1859, the German-American Jacob Kuechler (1823–1893) used crossdating to examine oaks (Quercus stellata) in order to study the record of climate in western Texas.During the first half of the 20th century, the astronomer A. Douglass founded the Laboratory of Tree-Ring Research at the University of Arizona.
NAIROBI, Kenya (AP) — Kenyan police shot and killed two people during riots by opposition supporters after President Uhuru Kenyatta was declared the winner in elections overshadowed by fraud allegations, authorities said Saturday, while a father said his 9-year-old daughter was killed by a s…
According to the calculations, Bolt exerted 81.58k J of energy during the 9.58 seconds, but only 7.79 per cent of this was used to achieve motion; the remaining 92.21 per cent (75.22 k J) was absorbed by the drag.
Co-author of the study, Jorge Hernandez, said: “Our calculated drag coefficient highlights the outstanding ability of Bolt.
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