[填空题]
A 55-kg person riding a bike puts all her weight on each p6,(+zs jk/w l hiwiku1edal when climbingv*rqp.o/fuwzec137w a hill. The pedals rotate in a circl1q cv.ewz*wfur3po7/ e of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?