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AP Physics C: Mechanics
6.4 Conservation of Angular Momentum
6.3 Angular Momentum and Angular Impulse
IntermediateMCQConceptual16.1k
A two-panel grayscale diagram labeled Initial on the left and Final on the right. In the Initial panel, a simplified stick figure stands centered on a horizontal circular platform mounted to a vertical support rod. The figure holds a horizontal bicycle wheel by its vertical axle; a vertical arrow labeled L_0 points straight upward from the wheel center. In the Final panel, the figure remains standing on the circular platform holding the bicycle wheel, but the axle is inverted; a vertical arrow labeled L_0 points straight downward from the wheel center. A curved arrow on the circular platform indicates counterclockwise rotation, with a vertical arrow labeled 2L_0 pointing straight upward from the platform axle. No other labels, lines, text, or axes appear.
The demonstration setup before and after the spinning bicycle wheel is inverted.
A person stands at rest on a low-friction turntable that is free to rotate about a vertical axis, holding a bicycle wheel that is spinning rapidly about a vertical axle with angular momentum of magnitude \(L_0\) directed upward. When the person inverts the wheel upside down by \(180^\circ\) so that its angular momentum points downward with magnitude \(L_0\), the person and turntable begin rotating such that their angular momentum is directed upward with magnitude \(2L_0\). Which of the following statements provides the correct physical explanation for this observation?

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