[填空题]
A 55-kg person riding4 io*wxezl7; s0 h5-obajdin r6d3(irt i(od3 u++b, wecd.af a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radito3b(u+ dd+,.e aiwc fus 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?