[填空题]
A 55-kg person riding a bike puts all her weight on). xijgz+ eb7l each pedal when climbingchhf;wq d :y-* a hill. The pedalqcyfh: ; h*-wds 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?