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1. An astronaut measures her ship moving at 0.75c to have a length of 32m. What is the proper length? 2. An object is observed

1. An astronaut measures her ship moving at 0.75c to have a length of 32m. What is the proper length? 2. An object is observed to be a length L with velocity v. It's proper length is given by which formula? 3. A ship flies by at 0.82c and is observed by ground-based radar to be 55m in length. What is the ship's proper length

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