A student at rest is handed a bicyle wheel pointed sideways, as shown in figure

Question

A student at rest is handed a bicyle wheel pointed sideways, as shown in figure 16a. In this orientation the wheel has no z component of angular momentum. Once the sutdent has the wheel, the z component of the angular momentum of the student plus the wheel is conserved. (Student is standing on a circle that can spin)

Explain what will happen if the student orients the bicycle wheel up as shown in FIgure 16b, so that the bicycle wheel is rotating counterclockwise as seen from above.

Multiple Choice:
A. student will start rotating counterclockwise, as seen from above, to conserve the total angular momentum of the student+wheel system
B. student will not rotate,
because the angular momentum of the wheel does not change
C. student will start rotating clockwise, as seen from above, to conserve the total angular momentum of the student+wheel system

Explain what will happen if the student orients the bicycle wheel down as shown in FIgure 16b, so that the bicycle wheel is rotating clockwise as seen from above

Multiple Choice:
A. student will not rotate, because the angular momentum of the wheel does not change
B. student will start rotating counterclockwise, as seen from above, to conserve the total angular momentum of the student+wheel system
C. student will start rotating clockwise, as seen from above, to conserve the total angular momentum of the student+wheel system

Explanation / Answer

16b)
student will start rotating clockwise, as seen from above, to conserve the total angular momentum of the student+wheel system
16c)
student will start rotating counterclockwise, as seen from above, to conserve the total angular momentum of the student+wheel system

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