[填空题]
A 55-kg person riding-gvufs. yx;uem5h y31f0n a0f a bike puts all her weight on each pedal whh- 7nm2:jxs pien climbing a hill. The ped i n-7pxmsj:2hals 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?