[填空题]
Suppose a 55-kg person stands rz*w, *9b .*o4zbol3y hotevbat the edge of a 6.5-m diameter merry-go-roundg*pmo i vauoc+m;1e26 turntablecp+g 1uevmaoo26*im; 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. $rad/s$