[填空题]
A 55-kg person riding a bike puts all hegr;kwrkx 2 kk :+l4r5eriogtvs:) h3zg.i nbr/,orr 78 weight on each pedal when climbing a hill. The pedals sbinr trh7,z: )io.ov8/grg3 rotate in a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?