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A flat surface of a thin uniform disk A of radius R is glued to a horizontal table. Another thin uniform disk B of mass M and with the same radius R rolls without slipping on the circumference of A, as shown in the figure. A flat surface of B also lies on the plane of the table. The center of mass of B has fixed angular speed ω about the vertical axis passing through the center of A. the angular momentum of B is nM ω R 2 with respect to the center of A. Which of the following is the value of n ? B A

1. 2
2. 5
3. 2 7
4. 2 9

Correct answer: 5

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