Coughing can cause air to move through yourwindpipe(气管) faster than the speed of sound — over 300 metres per second! ……

1. Oceans cover (覆盖) about 71% of Earth.2. About 80% of all life on Earth is under the ocean. 3. The speed of sound in water is 1,530 meters per second, 4.5 times as fast as the speed of sound in air ……

SYDNEY: Australian researchers announced a successful test last week of a hypersonic "scramjet?engine that went 7.6 times the speed of sound.The engine, which uses oxygen in the atmosphere to ignite ……

of 1,228km/h. That’s faster than the speed of sound. The speed of sound is 1,224km/h. Andy... of the car is Bloodhound (寻血猎犬). It uses rocket3 technology (科技). It can reach (达到) the speed of 1 ……

by NASA to test speeds fromMach(马赫) 7 up to Mach 10 (7 to 10 times the speed of sound, whichvaries(变化... of a new engine system. The designers expect it to set a new speed record for airplanes. ……

KUALA LUMPUR, Malaysia - A driver accused of going 1,146 kph in a 90 kph zone says there must be some mistake. That's nearly the speed of sound.While he doesn't claim to be completely innocent, Lim ……

per second. It is around twice as fast as the speed of sound in diamond, the hardest known material..., sound waves travel faster through materials with greater density (密度). The fastest speed is only ……

in a vacuum-sealed (真空密封的) centrifuge (离心机) and spinning (旋转) it at several times the speed of sound... times the speed of sound. It is then released and shoots toward space. Ultimately, the plan ……

Scientists have found the top speed of sound.   TUCHONGScientists have found the top speed...) – a little over 36 kilometers per second.However, this speed is only possible when sound travels ……

PhysicsThe speed of sound in steel is 6000 ms–1. The wavelength of an ultrasound (超声波) wave of frequency (频率) 50 khz traveling through a steel girder (梁) is ______.A. 0.0083 m B. 0.12 m C. 8.3 m D ……

the speed (计算速度). It is around four times faster than the speed of sound! When glass breaks... faster than the speed of sound! When glass breaks, the cracks (裂痕) move at about 3,000 miles (about ……

the speed of sound, the air is pushed hard, and it compresses (压缩) like the ripples on water... sonic boom when they crack the whip. Aircraft that travel faster than the speed of sound can also make ……

with Britain. Concorde flew at about 2,200 kilometres per hour. That's twice the speed of sound ……

the speed of sound. 学语法must的用法：must在文中表示推测，意为“肯定，一定”，如：She must be the first to get to school. （她肯 ……

even faster than the speed of sound.He wore a special spacesuit (太空服) to protect (保护) his body. Felix ……