[填空题]
(a) What is the angulazpq sc6j)kgfo212 x5p i puj;mt7r2s5ri: k el8 .qqs,rv :1aku,(kuxw q6k3dc momentum of a figure skater spinning 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? $m \cdot N$