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The factor g sub c appears in imperial engineering calculations because

  • A.mass and force units were defined independently
  • B.gravity varies appreciably from place to place
  • C.the pound is not a coherent unit of mass at all
  • D.temperature must always be converted to Rankine

Answer: A

The pound mass and the pound force were both defined so that one weighs one under standard gravity, which forces a conversion constant into Newton's second law. In SI the newton is defined so that the constant is one and disappears.

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