[填空题]
A 55-kg person ridinga6 (xnj48nh 7l3jciib, bu(cd a bike puts al4cvgtw e3py 7;qp0o 6i9n4b cql her weight on each pedal when climbing a hill. The pedals rotate in a circl7 ccvn ;obq4w p9tp 0g6qiy4e3e of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?