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23 Nov 2019
A runner carrying a horizontal pole of proper length 10 m runs at 0.866c through a barn whose proper length is 5.0 m. The farmer measures the length of the pole as only 5.0 m, due to length contraction. He is then determined to trap the runner in the barn by slamming the front door shut behind her when the pole is completely inside. The pole will smash through the back wall, but for an instant, the entire pole will be inside the barn. On the other hand, the runner observes that the barn's contracted length is only 2.5 m and declares that there is no way her 10 m pole is going to fit inside the barn. (a) Who is right? (b) Explain your answer.
A runner carrying a horizontal pole of proper length 10 m runs at 0.866c through a barn whose proper length is 5.0 m. The farmer measures the length of the pole as only 5.0 m, due to length contraction. He is then determined to trap the runner in the barn by slamming the front door shut behind her when the pole is completely inside. The pole will smash through the back wall, but for an instant, the entire pole will be inside the barn. On the other hand, the runner observes that the barn's contracted length is only 2.5 m and declares that there is no way her 10 m pole is going to fit inside the barn. (a) Who is right? (b) Explain your answer.
