单词：force of surface friction
单词：force of surface friction 相关文章
VOICE ONE: I'm Mario Ritter. VOICE TWO: And I'm Steve Ember with EXPLORATIONS in VOA Special English. This week, we tell about some of the biggest space stories of two thousand nine. First, there was the American space agency's discovery of water on
VOA慢速英语2009年（十二）月
But the friction and heat wears away at the space rock, the hot air actually melts the metal surface, and often the collision with the atmosphere can have a shattering effect, splitting the meteorites along fissures. This is an actual meteorite, and
探索与发现2014年
Hoverboards Ignore Gravity Can you imagine riding around the streets of your hometown on a skateboard without wheels? In the late 1980s, film director Robert Zemeckis showed a skateboard floating above the ground in his movie Back To The Future Part
2014年VOA慢速英语(十二)月
Under Pressure压力之下 In physics, pressure depends on the amount of force acting on a surface and on the size of the surface. The smaller the surface, the greater the pressure. Lets say that a woman steps on your toe; she weighs 120 pounds. If s
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By David McAlary Washington 06 March 2006 The newest American mission to Mars is hurtling toward the red planet, due Friday to examine it in the sharpest detail yet. It will be the largest spacecraft
2006年VOA标准英语（三月）
By David McAlary Washington 10 March 2006 Mars Reconnaissance Orbiter Another U.S. spacecraft has begun orbiting Mars to study the red planet in unprecedented detail. The Mars Reconnaissance Orbiter w
2006年VOA标准英语（三月）
A recent study estimates 66,000 homosexuals currently serve -- about two percent of the total in uniform. In 2002, David Hall was an Air Force sergeant studying to be an officer, pursuing his dream of becoming a military pilot. But once his sexual st
VOA标准英语2010年(三月)
New Skateboard Defies Gravity WASHINGTON A futuristic dream only a couple of decades ago, the hoverboard a skateboard that floats above the ground - has finally been made possible. While still not ready for mass production, it promises to become a co
VOA标准英语2014年(十一月)
Scott and his final team of five arrived at the South Pole in 1912 January to find they had been beaten to it by a Norwegian team led by Roald Amundsen, 1912年一月，斯科特和他的五人小分队 到达了南极点。但不巧，他们发现由挪
TED演讲娱乐篇
Scott and his final team of five arrived at the South Pole in 1912 January to find they had been beaten to it by a Norwegian team led by Roald Amundsen, 1912年一月，斯科特和他的五人小分队 到达了南极点。但不巧，他们发现由挪
TED演讲娱乐篇
If we could flip a switch and just turn off the Earth's magnetic field, it will take about 15,000 years to disappear, based on the rate of decay of the field that we've seen over the last 150 years. It's currently decaying at a rate that would see an
自然百科2011年
ENVIRONMENT REPORT - September 6, 2002: Geckos and Their Sticky Feet By Cynthia Kirk This is the VOA Special English ENVIRONMENT REPORT. Geckos are small lizards that live in warm climates. These liza
健康与环境
Huygens Spacecraft Arrives at Saturn Moon “慧更斯”号抵达土星卫星 After a seven-year ride to Saturn on the U.S. Cassini spacecraft, the European Space Agency's Huygens probe is finally at
VOA2005（上）--环境科学探索
BEIJING, Apr. 16 (Xinhuanet) -- China and the United States will experience more trade friction in the high-end manufacturing sector, as Washington protects its domestic industries, officials said on Sunday. Friction will surely increase as China and
英语新闻
Hello, I'm Justin Greene with the BBC news A video sent to the Nigerian government by the Islamist group Boko Haram appears to prove that some of the 276 girls kidnapped two years ago in the town of Chibok are still alive. The images apparently filme
中英双语新闻
On our last program, we learned how water bugs manage to stand on the surface of a pond: The pads of their feet resist contact with the water just like wax paper does. This allows the bug to rest on the thin film of surface tension that naturally cov
英语时差8，16
The scale is of course more an idea than an object, an arbitrary measure of the Earth's tremblings based on surface measurements. 当然，里氏震级是一个概念，不是一件东西，是一个根据地面测量的结果武断地得出的地球震
万物简史
China, EU to negotiate over solar panel friction BEIJING, Sept. 11 (Xinhua) -- The Chinese government on Tuesday sent a delegation to Europe to negotiate with the European Union (EU) about the trade friction over solar panel imports. The delegation,
英语新闻
Why Frisbees Fly With a gentle flick of the wrist on a warm summer day, you can launch a frisbee on a long and graceful flight. Why do they fly so well? One reason is something called gyroscopic force. This is the tendency of a spinning object to mai
英语听力文摘 English Digest