[填空题]
A 55-kg person riding a bike puts all her w*hyfu0fqvvc*ea +))3rj9h hleight on eat*th)hbv 1d 6sch pedal when climbing a hill. The pedals rotate in a circle of rabdht1s6)v t* hdius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?