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The many available speed-reading training programs may utilize books, videos, software, and seminars. There is little scientific evidence regarding speed reading, and as a result its value seems uncertain. Cognitive neuroscientist Stanislas Dehaene says that claims of reading up to 1,000 words per minute "must be viewed with skepticism". [1]
A supersonic aircraft is an aircraft which can exceed the speed of sound (Mach 1.0 ... First aircraft to pass 1,000 mph. ... North American F-100 Super Sabre: United ...
Land speed records by surface Category Speed (km/h) Speed (mph) Vehicle Operator Date Certifier Refs On ice: 335.7: 208.6: Audi RS 6: Janne Laitinen 9 Mar 2013 FIA [19] On the Moon: 18.0: 11.2: Apollo 17 Lunar Roving Vehicle (LRV‑003) Eugene Cernan: 11 Dec 1972 (unofficial) [20] On Mars: 0.18: 0.11: Mars Exploration Rovers Spirit and Opportunity
Tupolev Tu-95. The Guinness Book of World Records lists the Soviet Tupolev Tu-95 bomber and its derivatives (Tu-114 and Tu-142) as "the fastest propeller-driven aircraft in standard production form", with a maximum cruise speed of 925 km/h (575 mph; 499 kn) or Mach 0.82.
The Mach number is defined as a plane’s speed divided by the speed that sound waves move through the air. To “break the sound barrier” means to fly faster than the speed of sound, with Mach ...
Since a supersonic aircraft must also take off and land at a relatively slow speed, its aerodynamic design must be a compromise between the requirements for both ends of the speed range. One approach to resolving this compromise is the use of a variable-geometry wing , commonly known as the "swing-wing," which spreads wide for low-speed flight ...
Supersonic speed is the speed of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level , this speed is approximately 343.2 m/s (1,126 ft/s; 768 mph; 667.1 kn; 1,236 km/h).
The Speed Graphic was available in 2¼ × 3¼ inch, 3¼ × 4¼ inch, 5 × 7 inch and the most common format 4 × 5 inch. Because of the focal plane shutter, the Speed Graphic can also use lenses that do not have shutters (known as barrel lenses). [4] Using a Speed Graphic, especially with the rear shutter system, was a slow process.