The first intergalactic spaceship is headed toward the Magellanic Clouds at a speed of 0.8c. The spaceship is 1 000 m long. Clocks at the front and the rear of the spaceship both read 3:00 P.M. Can it be 3:00 P.M. simultaneously at the front and the back of the spaceship?
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No, because
, where
Δx is the length of the spaceship.
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No, because one clock has to move after being synchronized with the other.
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Yes, because Δx in (a) is zero for different points of the same spaceship.
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Yes, because two clocks at rest relative to each other can be synchronized by means of light signals when the distance between them is known.
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The question cannot be answered unless we know the object relative to which the spaceship's velocity is 0.8c.
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