A man is standing on a turn-table with an axle that has negligible friction. He

Question

A man is standing on a turn-table with an axle that has negligible friction. He is holding a bicycle wheel that is mounted on an axle of negligible friction. The man is initially rotating clockwise as seen from above and the wheel is not spinning about its own axle. The man wants to slow down his rate of rotation by spinning the wheel about its own axle. In which direction should he spin the bicycle wheel?

He should spin it counter-clockwise as seen from above.
There is not enough information to tell.
He should spin it clockwise as seen from above.
Spinning the wheel won't slow him down since the wheel and the man experience no net external torque and so their angular momentum must be conserved.

Explanation / Answer

The answer is:

He should spin it counter-clockwise as seen from above.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.