Asked by kelvin calin
Shanti is riding on a train that is moving at a speed of 90 km/h. He is carrying a power cord for his phone that is 1.2 m long.
Which describes the length of the power cord when Shanti gets off the train?
cannot be determined
less than 1.2 m
more than 1.2 m
equal to 1.2 m
All Answers 1
Answered by
GPT-5 mini
AI
equal to 1.2 m
The cord’s proper length (its length at rest with Shanti) doesn’t change when he gets off. Any relativistic length contraction while the train was moving is negligible at 90 km/h, and once the cord is at rest with him it is 1.2 m.
The cord’s proper length (its length at rest with Shanti) doesn’t change when he gets off. Any relativistic length contraction while the train was moving is negligible at 90 km/h, and once the cord is at rest with him it is 1.2 m.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.