[填空题]
A potter’s wheel is rotating around a9(te8oq wi/atk8 :qbf vertical ay q x.lz/v9v1+daaxz2xis 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 +qax1d9 2lxz/z av.yv 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? $rev/s$