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An early Hughes YAH-64 prototype with T-tail. After the AH-56 Cheyenne was cancelled in 1972 in favor of projects like the U.S. Air Force A-10 Thunderbolt II and the Marine Corps AV-8A Harrier, the United States Army sought an aircraft to fill an anti-armor attack role that would still be under Army command.
The MiG-21 jet fighter was a continuation of Soviet jet fighters, starting with the subsonic MiG-15 and MiG-17, and the supersonic MiG-19.A number of experimental Mach 2 Soviet designs were based on nose intakes with either swept-back wings, such as the Sukhoi Su-7, or tailed deltas, of which the MiG-21 would be the most successful.
Antarctica provides a unique environment for the study of meteorites: the dry polar desert preserves them well, and meteorites older than a million years have been found. They are relatively easy to find, as the dark stone meteorites stand out in a landscape of ice and snow, and the flow of ice accumulates them in certain areas.
States and union territories of India by the spoken first language [1] [note 1]. The Republic of India is home to several hundred languages.Most Indians speak a language belonging to the families of the Indo-Aryan branch of Indo-European (c. 77%), the Dravidian (c. 20.61%), the Austroasiatic (precisely Munda and Khasic) (c. 1.2%), or the Sino-Tibetan (precisely Tibeto-Burman) (c. 0.8%), with ...
According to the American National Center for Atmospheric Research, "The total mean mass of the atmosphere is 5.1480 × 10 18 kg with an annual range due to water vapor of 1.2 or 1.5 × 10 15 kg, depending on whether surface pressure or water vapor data are used; somewhat smaller than the previous estimate.
Jack Ma Yun (Chinese: 马云; pinyin: Mǎ Yún; born 10 September 1964) is a Chinese business magnate, investor, and philanthropist.He is the co-founder of Alibaba Group, a multinational technology conglomerate.
Baffin Island (formerly Baffin Land), [5] in the Canadian territory of Nunavut, is the largest island in Canada, the second-largest island in the Americas (behind Greenland), and the fifth-largest island in the world.
The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.