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MMLU-Pro / 10105 / A rod measures 1.00 m in its rest system. How fast must an observer move…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A rod measures 1.00 m in its rest system. How fast must an observer move parallel to the rod to measure its length to be 0.80 m?

category

physics

options

  1. 0.90c
  2. 0.80c
  3. 0.50c
  4. 0.55c
  5. 0.60c
  6. 0.75c
  7. 0.40c
  8. 0.70c
  9. 0.65c
  10. 0.20c

src

ori_mmlu-college_physics

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Source and history

Official source

initial import