[填空题]
A 55-kg person riding aotics c8or8v;d5ai**osm s 0h9 th..o bike puj /* ;biomql3vts all her weight on each pedal when climbing a hill. The pedals rotate iio*/bq vl;j3m n a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?