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OpenStudy (anonymous):
1. An astronaut leaves the earth and travels at 0.999c. He returns to earth after 10 years by his watch. How many years have passed on earth? 2. The astronaut in problem 1 traveled in a spacecraft that is 100m long when it is at rest. How long is the craft when it is in motion at 0.999c?
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OpenStudy (anonymous):
oh i got the 1st problem nevermind:)
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