[填空题]
A uniform disk turns4/md k 6i9o6m7ohwkdiit12sgt jzg4hjoi jy5; 300n9qtp wo7s s3*xw at 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? $rev/s$