[填空题]
Suppose a 55-kg person stands at the edge of a 6.5-m diametey68o qpvg,fi3zw+wh: r merry-go-ro5s)a3y ztqj- mund turntable that is mmsqy-)az5jt3 ounted on frictionless bearings and has a moment of inertia of 1700 $kg \cdot m^2$ 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. $rad/s$