General Science • PhysicsHard
A satellite is orbiting close to the Earth's surface in a circular orbit. What is the approximate value of its orbital speed, given that the radius of the Earth is about 6400 kilometers and acceleration due to gravity is 9.8 meters per second squared?
A. 3.1 kilometers per second
B. 7.9 kilometers per second✓ Correct Answer
C. 11.2 kilometers per second
D. 42.1 kilometers per second
💡 Solution & Explanation
The orbital speed for a close earth satellite is calculated using the square root of the product of acceleration due to gravity and Earth's radius, yielding approximately 7.9 kilometers per second. The value of 11.2 kilometers per second represents the escape velocity from Earth. Orbital speed is independent of the mass of the orbiting satellite.
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