[填空题]
A 55-kg person riding a bike puts all her wei l .p8j7gl r1ou9 fa7xb2-biymght*jo)2on m mwe* on each pedal when climbing a hill. The pedals rotate in a ciro2 wm*en )jmo*cle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?