[填空题]
A uniform disk turns at 2. yj8vod( - f-lf7rsij24e ihy2j8-b92iry9b o7 ycuk *x $rev/s$ 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? $rev/s$