sjogosk
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Real named experts · corrections over time · the nuance an AI answer skips
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sponteous
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What they're talking about here is the case where the wheel is not spinning. So it isn't spinning around the x-axis at all. The gyroscope is initially pointed along the x-axis. If you let go of it, it just falls over, staying in the x-z plane. Since the foot of the gyro is fixed at the pivot, that means the whole gyro is rotating about the y-axis.
sjogosk
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Thank you that clears it up a lot