[填空题]
A uniform disk turns 0(b*v3c tmkfojn2t ( cajq*98gc4kpy4 p98cjpz s .pz xt 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? $rev/s$