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A gyro's rotor speed falls from 20000 to 10000 revolutions per minute. For the same disturbing torque the precession rate

  • A.Doubles
  • B.Halves
  • C.Is unchanged
  • D.Falls to a quarter

Answer: A

Precession rate is inversely proportional to angular momentum, which is proportional to spin speed. Halving the speed therefore doubles the drift, which is why a failing vacuum pump makes an instrument progressively less trustworthy.

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