[填空题]
A potter’s wheel is rotatinnz74 a/k9mgp3saoz;kg around4yu ;bl ug*5lk a vertical axis through its center at a frequency 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 thro*b5gl4;l ukuyws 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? $rev/s$