[填空题]
A uniform disk turns at.,:x7k layoz+a7n f92ymz3ffya2 r)l xa shb- 2.ay5 la0wcy1wrew)h/6tg 4c5z*x y6 wo4 $rev/s$ 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? $rev/s$