[填空题]
A figure skater can increase her spin rotation rate fn8 rd a6fg.y8(* yuabhromaa)xy vjluu0h5*a+-o an initial rate of 1.0 rev evera+x -auj)vhl 0yo*5au y 2.0 s to a final rate of 3 $rev/s$ If her initial moment of inertia was 4.6 kg*$m^2$ what is her final moment of inertia? How does she physically accomplish this change? $kg \cdot m^2$