A 选项“By using wings”意为“通过使用翅膀”,卫星不是靠翅膀保持在轨道上的。B 选项“By using engines”意为“通过使用引擎”,卫星在轨道上主要依靠地球引力,而不是引擎。C 选项“By the force of gravity”意为“通过地球引力”,这是卫星保持在轨道上的主要原因。D 选项“By the power of the sun”意...
A. gas B. orbit C. chemicals D. vapors 相关知识点: 试题来源: 解析 B 解析:B [解析] [分析] [详解] 考查名词词义辨析。句意:把卫星放入轨道要花费多少钱?A. gas气体;B. orbit轨道;C. chemicals化学物质;D. vapors水蒸气。根据 satellite可知,此处用“轨道”符合句意,故选B项。反馈...
百度试题 结果1 题目6. How many satellites (satellite) have been put into orbit around the earth? 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
A.gasB.orbitC.chemicalsD.vapors试题答案 在线课程 【答案】B 【解析】 考查名词词义辨析。句意:把卫星放入轨道要花费多少钱?A. gas气体;B. orbit轨道;C. chemicals化学物质;D. vapors水蒸气。根据 satellite可知,此处用“轨道”符合句意,故选B项。练习...
To learn about dinosaurs, researchers have to study physical clues and put these clues into the context of current scientific knowledge. This can be a tricky process. There were no humans on Earth when dinosaurs lived, so there are no written records or illustrations of how they behaved or wh...
To place into orbit or to de-orbit takes about 100-500 ft/s (31-153 m/s) change in velocity. Orbital adjustments take about 2 ft/s (0.61 m/s) change in velocity. The engines can start and stop 1,000 times and have a total of 15 h burn time. Now let's put these pieces ...
Good question. Starlink is a satellite internet provider that uses LEO (Low-Earth Orbit) satellites in a massive constellation in order to beam service down to users in remote locations. There are already a ton of Starlink satellites in the sky, but that’s just scratching the surface of Sta...
Suppose that a satellite is in orbit 250 miles above the equator of the earth.About how much further does the satellite travel in one orbit than would a person traveling once around the equator on the surface of the earth?Round your answer to the nearest integer.The satellite travels about ...
Satellites in Low Earth Orbit (LEO) travel at a high speed, taking only around 90 minutes to orbit the Earth. While this speed allows for a quick coverage of the entire planet, it also presents challenges for communication. If a single satellite were to move at this speed, ground stations...
Spacecraft such as the Soyuz spacecraft and Progress supply ship dock with the ISS to transport astronauts and supplies to and from Earth. Assembly of the ISS began in November 1998 when a Russian proton rocket placed the first module, the Functional Cargo Block (Zarya), in orbit. A three...