[填空题]
Suppose a 55-kg person stands ze9t4 el 3k f4-pxlw(lat the edge of a 6.5-m diameter merry-go-roun7gqr ef( 2htt/d turntable that is mounted on frictionlessf2h( te7r t/qg 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. $rad/s$