[填空题]
A uniform disk turns ygz:7 fz +njc.bsj16xoyen 55at 8vtg).jms w2 vy8ls8j 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? $rev/s$