[填空题]
Suppose a 55-kg person stands 6xgt7rlr/7 uaat the edge of ajgvb i+2 gx/p6 6.5-m diameter merry-go-round turntablebg2g/ p6 ixv+j that is mounted 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. $rad/s$