某校在社会实践活动中，明明同学用一个直径为24 cm 的定滑轮带动重物上升.如图，滑 轮上一点A绕点O逆时针旋转105^∘ ，假设绳索（粗细不计）与滑轮之间没有滑动，则重物上升了( ) ---**Chart/Diagram Description:** * **Type:** Diagram illustrating a simple pulley system. * **Main Elements:** * A large circle representing a pulley, pivoted at its center. * A rope passes over the circumference of the pulley. * On the left side of the pulley, a section of rope hangs downwards. There appears to be an object attached to this end, likely a weight. An arrow points downwards near this object, indicating downward force or direction. * On the right side of the pulley, the rope continues downwards, possibly being pulled. There might be an arrow indicating the direction of pull on the right side, but it is indistinct. * The diagram shows the basic setup of a single fixed pulley used for lifting a load. * **Labels and Annotations:** There are no visible text labels or annotations on the diagram. * **Relative Position and Direction:** The pulley is positioned centrally. The weight/load is on the left side, hanging below the pulley. The pulling force/effort is applied to the rope on the right side, below the pulley. **Extracted Textual Information:** * There is no text content (question stem, options, labels, etc.) discernible in the provided image.