[填空题]
A 55-kg person riding u5k3f(s*gxyu8l 3x naa bike puts all her weight on wv :7yr9t0r kseach pedal when climbing a hill. syvkw:9 0 rt7rThe pedals rotate in a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?