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Blackbird (wind-powered Vehicle)
''Blackbird'' is an experimental wind-powered vehicle, built in 2010 to demonstrate that it is possible for such a vehicle to go directly downwind faster than the wind. ''Blackbird'' employs a rotor connected to the wheels and does not have a motor, battery or flywheel. It was constructed by Rick Cavallaro and John Borton of Sportvision, sponsored by Google and Joby Energy in association with the San Jose State University aeronautics department. In a test supervised and recognized by the North American Land Sailing Association in July 2010, Cavallaro achieved a speed of sailing directly downwind in winds: almost three times the speed of the wind. - Explanation of the Blackbird workings and its physics. In 2012, ''Blackbird'' also demonstrated sailing directly upwind with twice the speed of the wind. Theory Rotor-powered vehicles are wind-powered vehicles that use ''rotors''—instead of sails—which may have a shroud around them (ducted fan) or constitute an unducted propell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brain Teaser
A brain teaser is a form of puzzle that requires thought to solve. It often requires thinking in unconventional ways with given constraints in mind; sometimes it also involves lateral thinking. Logic puzzles and riddles are specific types of brain teasers. One of the earliest known brain teaser enthusiasts was the Greek mathematician Archimedes. He devised mathematical problems for his contemporaries to solve. Example :Q: ''If three hens lay three eggs in three days, how many eggs does a (statistical) hen lay in one day?'' :A1: ''One third.'' (Note: 3 hens = 3 eggs / 3 days → 3 hens = (3 / 3) (eggs / days) → 1 hen = (1 / 3) (egg / days)) :A2: ''Zero or one'' (it's hard to lay a third of an egg). One can argue about the answers of many brain teasers; in the given example with hens, one might claim that all the eggs in the question were laid in the first day, so the answer would be three. :Q: ''Mary's father has five daughters: 1. Nana, 2. Nene, 3. Nini, 4. Nono. What is t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Motorized Trikes
List of motorized trikes is a list of motorized tricycles also called trikes, and sometimes considered cars. There are three typical configurations: motorized bicycle with sidecar; two wheels in the rear, one in the front (aka trike); and two in front, one in the rear (aka reverse trike). However, language and definitions vary. One of the most successful trikes of its day was the De Dion-Bouton tricycle; from 1897 until the start of the 20th century about 15,000 licensed copies were sold, with De Dion Bouton usually supplying the engines, and it was overall the most popular motor vehicle in Europe. Trikes have caused tautological confusion and simply defied typical two and four-wheel classifications, especially in the 21st century. Regardless, many popular motorcycles and/or automobiles had three wheels. Examples 17th century *Stephan Farffler's trike 18th century * Cugnot's ''fardier à vapeur'' (steam powered) 19th century * Ariel 2.25 hp tricycle (1898) * Benz Pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenbird
''Greenbird'' is a wind-powered vehicle that broke the land speed record for sail-powered vehicles at the dry Ivanpah Lake on March 26, 2009. It was built by the British engineer Richard Jenkins. ''Greenbird'' reached a peak speed of 126.1 mph (202.9 km/h). Construction ''Greenbird'', sponsored by Ecotricity, was described as being "a very high performance sailboat". It uses a rigid vertical wing, instead of the conventional sail, to generate thrust, in the same manner that the wing of an aeroplane generates lift. The only metal in the vehicle is in the wheels and the wing bearings; the remainder is made of carbon composite materials. The vehicle weighs about six hundred kilograms. According to Jenkins, the light weight and aerodynamic shape of the vehicle allows it to attain speeds three to five times faster than the speed of the wind. ''Greenbird'' is the fifth in a series of wind-powered land vehicles that Jenkins had constructed in his efforts to break the speed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bill Nye
William Sanford Nye (born November 27, 1955), popularly known as Bill Nye the Science Guy, is an American mechanical engineer, science communicator, and television presenter. He is best known as the host of the science television show ''Bill Nye the Science Guy'' (1993–1999) and the Netflix show ''Bill Nye Saves the World'' (2017–2018), and for his many appearances in popular media as a science educator. Born in Washington, D.C., Nye began his career as a mechanical engineer for Boeing in Seattle, where he invented a hydraulic resonance suppressor tube used on Boeing 747, 747 airplanes. In 1986, he left Boeing to pursue comedy—writing and performing for the local Sketch comedy, sketch television show ''Almost Live!'', where he regularly conducted wacky science experiments. Aspiring to become the next Don Herbert, Mr. Wizard, Nye successfully pitched the children's television program ''Bill Nye the Science Guy'' to Seattle's public television station, KCTS-TV. The show ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neil DeGrasse Tyson
Neil deGrasse Tyson ( or ; born October 5, 1958) is an American astrophysicist, author, and science communicator. Tyson studied at Harvard University, the University of Texas at Austin, and Columbia University. From 1991 to 1994, he was a postdoctoral research associate at Princeton University. In 1994, he joined the Hayden Planetarium as a staff scientist and the Princeton faculty as a visiting research scientist and lecturer. In 1996, he became director of the planetarium and oversaw its $210 million reconstruction project, which was completed in 2000. Since 1996, he has been the director of the Hayden Planetarium at the Rose Center for Earth and Space in New York City. The center is part of the American Museum of Natural History, where Tyson founded the Department of Astrophysics in 1997 and has been a research associate in the department since 2003. From 1995 to 2005, Tyson wrote monthly essays in the "Universe" column for '' Natural History'' magazine, some of which were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Derek Muller
Derek Alexander Muller (born 9 November 1982) is an Australian-Canadian science communicator, filmmaker, and television personality, who is best known for his YouTube channel Veritasium. Muller has also appeared as a correspondent on the Netflix web series ''Bill Nye Saves the World'' since 2017. Early life and education Muller was born to South African parents in Traralgon, Victoria, Australia, and moved to Vancouver, British Columbia, Canada, when he was 18 months old. In 2000, Muller graduated from West Vancouver Secondary School. In 2004, Muller graduated from Queen's University in Kingston, Ontario, with a Bachelor of Applied Science in Engineering Physics. Muller moved to Australia to study film-making, but instead enrolled for a Ph.D. in physics education research from the University of Sydney, which he completed in 2008 with a thesis: ''Designing Effective Multimedia for Physics Education''. He was still looking for a creative career but did not find a dir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
YouTube
YouTube is a global online video platform, online video sharing and social media, social media platform headquartered in San Bruno, California. It was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim. It is owned by Google, and is the List of most visited websites, second most visited website, after Google Search. YouTube has more than 2.5 billion monthly users who collectively watch more than one billion hours of videos each day. , videos were being uploaded at a rate of more than 500 hours of content per minute. In October 2006, YouTube was bought by Google for $1.65 billion. Google's ownership of YouTube expanded the site's business model, expanding from generating revenue from advertisements alone, to offering paid content such as movies and exclusive content produced by YouTube. It also offers YouTube Premium, a paid subscription option for watching content without ads. YouTube also approved creators to participate in Google's Google AdSens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Kusenko
Alexander Kusenko is a theoretical physicist, astrophysicist, and cosmologist who is currently a Professor of Physics and Astronomy at the University of California, Los Angeles (UCLA). In addition, Kusenko holds an appointment of Senior Scientist at the Kavli Institute for the Physics and Mathematics of the Universe (IPMU) since February 2008. He has served as a general member of the board of Aspen Center for Physics 2004-2019. Kusenko was awarded the status of Fellow of the American Physical Society in 2008 for ''original and seminal contributions to particle physics, astrophysics, and cosmology''. In 2021, Kusenko was awarded a Simons Fellowship in Theoretical Physics. In 2021, he entered a $10,000 wager with Derek Muller over the possibility of sailing straight downwind faster than the wind, which he later conceded. References External links *Scientific publications of Alexander Kusenkoon INSPIRE-HEP *''Scientists may have solved mystery of matter’s origin'' by S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of California, Los Angeles
The University of California, Los Angeles (UCLA) is a public land-grant research university in Los Angeles, California. UCLA's academic roots were established in 1881 as a teachers college then known as the southern branch of the California State Normal School (now San José State University). This school was absorbed with the official founding of UCLA as the Southern Branch of the University of California in 1919, making it the second-oldest of the 10-campus University of California system (after UC Berkeley). UCLA offers 337 undergraduate and graduate degree programs in a wide range of disciplines, enrolling about 31,600 undergraduate and 14,300 graduate and professional students. UCLA received 174,914 undergraduate applications for Fall 2022, including transfers, making the school the most applied-to university in the United States. The university is organized into the College of Letters and Science and 12 professional schools. Six of the schools offer undergraduate degre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
El Mirage Dry Lake
El Mirage Lake is a dry lake bed in the northwestern Victor Valley of the central Mojave Desert, within San Bernardino County, California. The lake is located about west-northwest of the town of Adelanto and north of Highway 18 in San Bernardino County. The dry lake, at an elevation of , is approximately long. El Mirage Off-Highway Vehicle Recreation Area (OHV) Formerly open to all visitors, it has been a popular spot for many activities ranging from gyrocopter and ultralight aircraft operations to automobile racing. The Bureau of Land Management has installed a fence to enclose the lake and some of the surrounding areas, and now charges fees for entry to what is now known as the El Mirage Off-Highway Vehicle (OHV) Recreation Area. It is a popular filming location for automobile commercials. Permits for the Recreation Area can be purchased on-site, at local retailers and online. Annual permits are $90, weekly permits are $30, and daily permits are $15. Private aircraft may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Douglas Aircraft Company
The Douglas Aircraft Company was an American aerospace manufacturer based in Southern California. It was founded in 1921 by Donald Wills Douglas Sr. and later merged with McDonnell Aircraft in 1967 to form McDonnell Douglas; it then operated as a division of McDonnell Douglas. McDonnell Douglas later merged with Boeing in 1997. History 1920s The company was founded as the Douglas Company by Donald Wills Douglas Sr. on July 22, 1921 in Santa Monica, California, following dissolution of the Davis-Douglas Company. An early claim to fame was the first circumnavigation of the world by air in Douglas airplanes in 1924. In 1923, the U.S. Army Air Service was interested in carrying out a mission to circumnavigate the Earth for the first time by aircraft, a program called "World Flight". Donald Douglas proposed a modified Douglas DT to meet the Army's needs. The two-place, open cockpit DT biplane torpedo bomber had previously been produced for the U.S. Navy.Rumerman, Judy. "The Dougla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
