[填空题]
A uniform disk turns ax w* * y dgo;9rtyjdo.5z9ev6pt 0svgw35r7z)xq3 ci. nr1p frk2.4 $rev/s$ 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? $rev/s$