[填空题]
A 55-kg person riding a bike puts all her weight on 9ns -sjzz bg/+each pedal when ie e qef0z;gb(-t ouh c.37gs6climbing a hill. The pedals rotate in a circle b ;-gef ut0c3h z( 7eegi6qos.of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?