6. A man holding a spinning bicycle wheel is standing on a stationary turntable

Question

6. A man holding a spinning bicycle wheel is standing on a stationary turntable as shown. If he turns his wheel 90 degree so that his Left arm is now ''out of the page,'' closer to you, and the wheel's axel is perpendicular to this paper, then the turntable will: (a)Spin in the -w direction with +L momentum. (b)Spin in the -w direction with -L momentum. (c)Spin in the +w direction with -L momentum. If the _ of an object Is great enough and its _ is small enough then escape speeds may exceed the _ . This results in a _ 11. the Initial distance between the balls In problem #6 is tripled to a final position then how will the final force of gravity F, compare to the initial Fi?

Explanation / Answer

Initially, the total angular momentum of the system is 0.

By conservation of angualr momentum, even after he turned his wheel, the angular momentum must still be 0.

Thus, the turntable will counter the motion of the wheel, and it will rotate with CLOCKWISE (-w) with -L momentum.   [OPTION B, ANSWER]

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