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;...
(6) About seventy percent of the earth's surface is covered with water. ___, it looks blue from space. 28.Sandra was (determine) to become a doctor, and finally her years of effort paid off. 29.The ceremony (tr...
A. A Satellite Orbiting the Earth B. A Space Hotel—Aurora Station C. Aurora Station: a New Living Place for Man D. New Hotel That Brings People Great Benefits 使用: 106 34阅读七选五 中 How to Speak in Meetings Mak...
Earth’s gravity pulls everything toward the center of the planet. To stay in the earth’s orbit, the speed of a satellite must adjust to the tiniest changes in the pull of gravity.(人造卫星利用重力保持在轨道上。地球的引力把所有东西都拉向地球的中心。为了保持在地球轨道上运行,卫星的速度必须...
differenttypesandheightsoforbits,basedonthetaskstheyneedtoperform.Satellitesclosertotheearthareinlow-earthorbit,whichcanbe200-500mileshigh.Theclosertotheearth,thestrongerthegravityis.Therefore,thesesatellitesmusttravelatabout17,000milesperhourtokeepfromfallingbacktotheearth,whilehigher-orbitingsatellitescantravel...
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 ...
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...
ountis around the globe arespendingbillions ofdollars and lots of time onvariousspace missions, whetherto Mars or other planets muchfurther away. Some people arguethat we should stop wastingtime and money exploring space.Instead, we should feed theNASA satellite image ofworld's poor and find ...
A satellite is an object in space that orbits around another. It has two kinds — natural satellites and artificial satellites. The moon is a natural satellite that moves around the earth while artificial satellites are those made by man. Despite their widespread impact on daily life, artificial...
D A satellite the size of a microwave oven successfully broke free from its orbit around Earth on Monday and is headed toward the moon.It's been an unusual journey already for the CAPSTONE satellite. It was launched six days ago from New Zealand by the company Rocket Lab in one of their...