[填空题]
(a) What is the angu/9s- +e4 vi2v6zx wd l7lcyh7l0yjq gklar momentum of a figure skater spintu 7+ p2;t9 7fp*kvnyrot1ypwning at 3.5 $rev/s$ with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.5 m, a radius of 15 cm, and a mass of 55 kg? $kg \cdot m^2$ (b) How much torque is required to slow her to a stop in 5.0 s, assuming she does not move her arms? $m \cdot N$