UNIVERSE
SATELLITESICY BODIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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true
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false
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Either A or B
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None of the above
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Detailed explanation-1: -Satellites closer to the earth travel at lower speeds than satellites that are far away from earth. Explanation: Satellites that are near earth have to move at higher speeds to sustain their orbit since the gravitational pull is much higher.
Detailed explanation-2: -The orbital velocity of the satellite depends on its altitude above Earth. The nearer to Earth, the faster the required orbital velocity. At an altitude of 124 miles (200 kilometers), the required orbital velocity is a little more than 17, 000 mph (about 27, 400 kph).
Detailed explanation-3: -Because it is accelerated by our planet’s gravity, the satellite moves very quickly when it is close to the Earth. As it moves away, its speed slows, so it spends more time at the top of its orbit farthest from the Earth.
Detailed explanation-4: -This orbit requires little velocity to maintain its position because at this distance there is very little gravitational pull from the Earth. The closer satellites are to Earth the more likely it is that they will run into traces of Earth’s atmosphere which create drag.
Detailed explanation-5: -Orbits and changing speed If the force between them is greater, a greater acceleration will occur. The greater the acceleration, the greater the change in velocity-this causes the object to move faster. This means that objects in small orbits travel faster than objects in large orbits.
Detailed explanation-6: -So, how fast do satellites fly? Earth observation satellites fly in orbits at altitudes of about 200 to 2, 000 km, called low earth orbit, at a speed of about 28, 800 km per hour. This is about 90 times faster than the maximum speed of the Shinkansen bullet train, which is said to be 320 km per hour.
Detailed explanation-7: -Gravity is stronger the closer you are to Earth. And satellites that orbit close to Earth must travel at very high speeds to stay in orbit. For example, the satellite NOAA-20 orbits just a few hundred miles above Earth. It has to travel at 17, 000 miles per hour to stay in orbit.