[填空题]
A 55-kg person riding a bike puts all her weiu 2sqew pj-j/ ,x1+s(*uuysscght on ea2h 83fee*f93hpdykww 1ee ek8( 1ztamch pedal when climbing a hill. The pedals rotate inky zke1fw ee 93wt231h* mea8(hf8epd a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?