Long description: block4fig4
Alt text: A circular disc is shown rotating around a vertical axis passing through its center, labeled O.
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- The image displays a two-dimensional circular disc, depicted as a solid, flat shape.
- A vertical dashed line passes through the center of the disc, labeled O, indicating the axis of rotation.
- Curved arrows are drawn on the top surface of the disc, indicating a rotational motion around the central axis.
- A horizontal arrow extending from the center O labels a distance 'a', presumably representing the radius of the disc.