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ARC-Easy / NYSEDREGENTS_2015_8_35 / Scientists have created trains that use magnets to make the trains float above…

Problem

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question

Scientists have created trains that use magnets to make the trains float above the tracks as they travel. These trains float because

choices

  • the track is waxed
  • the like poles repel
  • the train has a low density
  • a chemical change occurs

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