An astronaut circling the earth at an altitude of 400 km
Chapter 13, Problem 13.72(choose chapter or problem)
An astronaut circling the earth at an altitude of 400 km is horrified to discover that a cloud of space debris is moving in the exact same orbit as his spacecraft, but in the opposite direction. The astronaut detects the debris when it is 25 km away. How much time does he have to fire his rockets and change orbits?
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