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What should be the speed of an artificial satellite moving on a circular orbit around the...

What should be the speed of an artificial satellite moving on a circular orbit around the Earth at a distance of 400 km from the surface of the Earth? Express your answer in km/ sec and also miles per hour. This exercise tells you that objects in space are typically moving very fast and gives you an idea of why the impact of a meteorite or comet on Earth can cause extinction level events.

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