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Worksheet: Simultaneity

Q1:

Two astronomical events are observed from Earth to occur at a time of 0.30 s apart and a distance separation of 2 . 0 × 1 0 9 m from each other. How fast must a spacecraft travel from the site of one event toward the other to make the events occur at the same time when measured in the frame of reference of the spacecraft?

  • A 2 . 1 × 1 0 7 m/s
  • B 1 . 7 × 1 0 7 m/s
  • C 2 . 5 × 1 0 7 m/s
  • D 1 . 4 × 1 0 7 m/s
  • E 2 . 9 × 1 0 7 m/s

Q2:

An observer sees two events 2 . 5 0 × 1 0 8 s apart at a separation of 700 m. How fast must a second observer be moving relative to the first to see the two events occur simultaneously?

  • A 0 . 0 2 5 𝑐
  • B 0 . 1 1 0 𝑐
  • C 0 . 0 1 0 𝑐
  • D 0 . 0 1 1 𝑐
  • E 0 . 2 5 0 𝑐