[填空题]
What is the angular momente( un6 f*ke1 ;qsw,yo z+yfu2lum of a 0.210ussb8au: x8*e qhw9 ycg.. h2e-kg ball rotating on the end of a thin string in a ci9qs hshw2u:g8. e.ab8yuce x* rcle of radius 1.10 m at an angular speed of 10.4 $rad/s$? $kg \cdot m^2$