[填空题]
A 55-kg person riding a bik*shqikof5 lto6 h5+2 v g;,of0mw h aswt1ev57e puts all her weight on each pedal when climbing a hill. The pedals rotwt mh;aeo71v 5gs0f w,ate 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?