[填空题]
A 55-kg person riding rtk8h 2 o1szdzs6ud 72 aq(:toa bike puts all her wer./ ib.ztaatv rud9 16ight on each pedal when climbing a hill. Thezd9ab. 1ri6.turv at/ pedals 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?