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The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a ...
Lockheed XP-58. The Lockheed P-38 Lightning is an American single-seat, twin piston-engined fighter aircraft that was used during World War II. Developed for the United States Army Air Corps (USAAC) by the Lockheed Corporation, the P-38 incorporated a distinctive twin-boom design with a central nacelle containing the cockpit and armament.
muscle spasm. Less common causes of flank pain include: pneumonia. pancreatitis. appendicitis. inflammatory bowel disease, such as Crohn’s disease. renal infarct, which occurs when a blood clot ...
The Lockheed F-104 Starfighter is an American single-engine, supersonic interceptor which was extensively deployed as a fighter-bomber during the Cold War.Created as a day fighter by Lockheed as one of the "Century Series" of fighter aircraft for the United States Air Force (USAF), it was developed into an all-weather multirole aircraft in the early 1960s and produced by several other nations ...
Ned Kelly's father, John Kelly (known as "Red"), was born in 1820 at Clonbrogan, near Moyglas, County Tipperary in Ireland. At the age of 21, he was found guilty of stealing two pigs [5] and was transported on the prison ship Prince Regent , arriving at Hobart Town, Van Diemen's Land (now Hobart in the Australian state of Tasmania ), on 2 ...
Lists. v. t. e. The flanking maneuver is a basic military tactic with several variations. Flanking an enemy entails attacking from one or more sides, at an angle to the enemy's direction of engagement. There are three standard flanking maneuvers. The first maneuver is the ambush, where a unit performs a surprise attack from a concealed position.
USS. Maine. (1889) Maine was a United States Navy ship that sank in Havana Harbor on February 15, 1898, contributing to the outbreak of the Spanish–American War in April. U.S. newspapers, engaging in yellow journalism to boost circulation, claimed that the Spanish were responsible for the ship's destruction.
On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States. A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am. The eruption, which had a volcanic explosivity index of 5 ...