A satellite is orbiting the Earth. What force keeps it in orbit? A. Frictional force B. Magnetic force C. Gravitational force D. Nuclear force 相关知识点: 试题来源: 解析 C。解析:卫星绕地球运行是因为地球对卫星的万有引力提供了向心力,使其能够在轨道上运行。A选项,太空中卫星几乎不受摩擦力;...
The orbital velocity of an satellite in a circular orbit just above the earth's surface isv. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is View Solution The earth is assumed to be a sphere of radius R. A platform is arranged at a heigh...
6 A spy satellite orbiting (沿轨道运行) 400 km above Earth is ___ capable of counting individual people in a crowd.相关知识点: 试题来源: 解析 highly 间谍卫星在距离地球400公里的轨道上运行,能够在人群中识别个体,这说明它拥有极高的分辨率。因此,填入形容词“highly”来描述卫星的这种能力,表示它“高...
David FrancisForeign Policy
A satellite is an object in space that orbits or circles around a bigger object. There are two kinds of satellites: natural (such as the moon orbiting the Earth) or artificial (such as the International Space Station orbiting the Earth). There are dozens upon dozens of natural satellites in...
5. A satellite orbiting Mars has taken the most detailed(detail) measurements yet of how these rare events trap water, which may help explain what happened to the water that used to be abundant on the Red Planet. 相关知识点: 试题来源: ...
A satellite is orbiting the earth in a circular orbit of radius r. Its Akinetic energy veries as r Bangular momentum varies as r−1 Clinear momentum varies as r2 Dfrequency of revolution varies as r−3/2Submit A satellite of mass m is orbiting the earth in a cicular orbit of radi...
Today, whether a satellite orbiting Earth or a smartphone in your pocket, all of these devices boil down to changing light into numbers representing the brightness of the sky at each pixel (像素). Some stars in the sky slightly change their brightness over time. With digital technology, the ...
“With six major planets, its architecture is intriguing,” Knicole Colon, a NASA astrophysicist and exoplanet expert, said in an email. “These planets are likely not going to support life, as they are all likely too warm and too large. But still the whole sub-Neptune angle is ...
Polar-orbiting spacecraft, such as Cluster, can investigate both the solar wind and the polar lobes. In both cases, the density is much lower than in the ionosphere. It was early realized that a spacecraft in a low-density plasma generally will be positively charged since satellite photo-emi...