[填空题]
A uniform disk turns ato+m t cv2j;0 ri .uv;:unomz5o 2c qidukja4:adx 1 (b3nry5 0y0.4 $rev/s$ around a frictionless spindle. A nonrotating rod, of the same mass as the disk and length equal to the disk’s diameter, is dropped onto the freely spinning disk, Fig. 8–49. They then both turn around the spindle with their centers superposed. What is the angular frequency in rev/s of the combination? $rev/s$