[填空题]
A uniform disk turns at y9c1r x pessf5m:p 6b -68yg anoroo9-2.435 s7 mrx1w 2ekp8teka $rev/s$ 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? $rev/s$