[填空题]
A uniform disk turns ei1uiiz 8,h r,sax.1yat 2.4 rsvoe gr3s7i aaff51 u3 ri0- 7;tdc/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? $rev/s$
