The New Book of KnowledgeGrolier Incorporated, 2002 - Počet stran: 21 An illustrated encyclopedia with articles on history, literature, art and music, geography, mathematics, science, sports, and other topics. Some articles include activities, games, or experiments. |
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Strana 39
... Speed and Turbulence There is a certain minimum speed that an airplane must have if the amount of lift is to be greater than the force of gravity . This mini- mum speed is called the airplane's stalling speed . A plane must be moving ...
... Speed and Turbulence There is a certain minimum speed that an airplane must have if the amount of lift is to be greater than the force of gravity . This mini- mum speed is called the airplane's stalling speed . A plane must be moving ...
Strana 40
... speed of sound . When the plane reaches the speed of sound , the waves begin to pile up , forming a sort of wall called a shock wave . When the airplane moves at supersonic speed , the wall bends ahead of the airplane , leaving shock ...
... speed of sound . When the plane reaches the speed of sound , the waves begin to pile up , forming a sort of wall called a shock wave . When the airplane moves at supersonic speed , the wall bends ahead of the airplane , leaving shock ...
Strana 567
... speed and altitude records would continue to be challenged and broken . An intense inter- national rivalry developed . The first official postwar speed record of 603 miles ( 971 kilo- meters ) per hour was set in 1945 by a British ...
... speed and altitude records would continue to be challenged and broken . An intense inter- national rivalry developed . The first official postwar speed record of 603 miles ( 971 kilo- meters ) per hour was set in 1945 by a British ...
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