A geostationary communications satellite orbits the earth directly above the equator at an altitude of 34800km?
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Calculate the time it takes for a signal to travel from a point on the equator to the satellite and back to the ground at another point on the equator exactly halfway around the earth.
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Answer:
Since the second point is halfway around the Earth, the signal will never get there. The mass of the Earth is between the satellite and the second point. Geostationary satellites can't see even half of the world. In fact they are useful only for about 1/3 of the world directly under them: about 75 degrees of latitude or longitude in each direction.
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