[填空题]
A 55-kg person riding a bike9* e6 prpendqln/h;q 2jzn 1,t7jpdz4,a6jgzv3khe v -(6ue wputs all her weight on each pedal when climbing a hill. The peda (v6z 3z jedw,647pehjuk-vgals 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?