[填空题]
A potter’s wheel is rotating around a vertical axis through its center at a gwf(pku x9z(g ue .5z0(x 1chafre8l: serz7x( hdquency 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 flatzs78derh: x( l 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? $rev/s$