[填空题]
What is the angular momentum of a 0.210ovk3j oq07fpol9 43h 4chsh,s,2ibr je dwlmoqz9s;sh5+ 13 e-kg ball rotating on the end of a thin string in a circle of radius 1.10 m i3eh1jz 5sw9s dmo2belq+,; r at an angular speed of 10.4 $rad/s$? $kg \cdot m^2$