Discussion
A gyro precesses 2 degrees in 30 seconds under a constant torque. The precession rate is
Answer: A
Correct answer: 240 degrees per hour
Scale the observed movement up to an hour:
\[ \frac{2^\circ}{30\ \mathrm{s}} \times 3600 = 240\ \mathrm{deg/h} \]
That is a very high rate for an instrument gyro, where real drift is measured in single degrees per hour, so it indicates a substantial applied torque rather than ordinary friction. The arithmetic is a units conversion, and the trap is dividing rather than multiplying by the number of seconds in an hour.
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