[填空题]
A potter’s wheel is r pbz 9a/zw;z n60onrc0otating around a vertical axwj kh) mt.-3gvis through its center at a frequenc3w j kmt)-hvg.y of 1.5rev/s The wheel can be considered a uniform disk of mass 5.0 kg and diameter 0.40 m. The potter then throws a 3.1-kg chunk of clay, approximately shaped as a flat disk of radius 8.0 cm, onto the center of the rotating wheel. What is the frequency of the wheel after the clay sticks to it? $rev/s$