[填空题]
Suppose a 55-kg person stands at the edge of a 6.5-m diavivf3c j/a2xdf x) wj)/9n4a rmeter merafe42f l )1vbmry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 170f4f)ae12bl mv 0 $kg \cdot m^2$ The turntable is at rest initially, but when the person begins running at a speed of 3.8 $m/s$ (with respect to the turntable) around its edge, the turntable begins to rotate in the opposite direction. Calculate the angular velocity of the turntable. $rad/s$