The size of a vibration iscalled its amplitude (振幅), so the louder the sound is, the biggerthe amplitude is.Sound waves travel at a speed of 330 metres per secondthrough air at 0℃. This speed increases(增加) if the airtemperature goes up, and decreases(减少) if the temperaturegoes ...
The characteristics of the vibration caused by the high-speed railwaysShibata, ToshinobuMatsuhisa, Hiroshi
Sound must travel through matter, because it needs the vibration of molecules to travel. The matter that transports the sound is called the medium. Speed of sound The speed of sound is how fast the wave or vibrations pass through the medium or...
We can also see something else: If we increase the temperature without changing the density of the gas, i.e., if we increase the speed of the atoms, what is going to happen to the pressure? Well, the atoms hit harder because they are moving faster, and in addition they hit more ofte...
These booming populations attract predators. New York City is home to a million pigeons, which support large populations of raptors. But pigeons’ aptitude for swift flight, further exploited by being bred for racing, means they’re made for high-speed chases. Compared to barn owls, which are...
1.1 翻译的标准 第1节 翻译练习1 the power plant is the heart of a power unit for driving the machines is a 50-hp induction motor.动力装置是船舶的心脏。 驱动这些机器的动力装置是一台50马力的感应电动机。 第1节 翻译练习2 semiconductor devices, called transistors, are replacing tubes in many ...
The silver color on some of the roll is just trapped air as the product is wound at high speed. The natural color on the roll is a slight yellow and over time as the air escapes the rolls will all be that color. Notice the film is clear when you unwind from roll a 正在翻译,请...
The Evolutionary Mystery: Crocodile Survives A Even though crocodiles have existed for 200 million years, they’re anything but primitive. As crocodiles’ ancestors, crocodilia came to adapt to an a…
Meditative running is not a race, there are no comparisons. Do not compete for speed, stay with yourself. What fits you the best is the best (find your own suitable speed and breathing frequency). (4)关注呼吸(鼻吸口呼,...
[translate] ait is caused for the speed is not large enough to milling , and accompanied by a slight vibration caused . 它为速度导致不是足够大到碾碎和由导致的轻微的振动陪同。[translate]