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A farm boy studying physics believes that he can fit a 15.0-m-long pole into a 12.0-m-long barn if he runs fast enough (carrying the pole). Can he do it? Explain in detail. How does this fit with the idea that when he is running the barn looks even shorter to him than 12.0 m?

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In special relativity, simultaneity is relative to the observer's frame of reference. Say the boy did move fast enough such that the pole contracted, in the frame of reference of an outside observer, the two ends of the pole fit simultaneously inside the barn.

In the boy's frame of reference, however, the two ends of the pole would enter the barn not simultaneously as he is moving at the same speed as the pole; for him, the length of the pole would have not contracted.

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