[填空题]
A 55-kg person riding wdj 6h ezaetz/q;7 nnc4.g3hq hc57.ta bike puts all her wei*a3hwjank u3 yag, *7jght on each pedal when climbing a hill. The pedals rotate in a circle of raa 3anj,yja7k*3hgu w*dius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?