A student on the ground observes the sun just as it sets. His friend, who is located
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A student on the ground observes the sun just as it sets. His friend, who is located 100 meters higher up in a tall building, tells him via cell phone that she observes the sun setting 77 seconds after he does. Assuming that the path of the setting sun is perpendicular to the horizon, use this information to estimate the radius of the Earth.
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