[填空题]
A uniform disk turns f-8 oer3m1cpja op60t at t /*fsz /iur q7h9mn2n4rvz4x 2.4 $rev/s$ 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? $rev/s$