[填空题]
A potter’s wheel is rotating around: qkpo30 sb8gd a vertical axi) lgr;j yr+ 3my:iyu4ls 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 throws a 3.1-kg ch) 43y+;rlyu ljmiryg: unk 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? $rev/s$