[填空题]
A 55-kg person ridinnse3 :0x*af/9 utd yxo s3dy)pg a bike puts all s q3gl4l6zg/ 37ydosu. wjgr/her weight on each pedal when climbing a hill. The pedals rotate in a circle l7z/l3 yqrgs.og6d4 gu3j/ sw of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?