[填空题]
A 55-kg person riding a bike puts * ,nsll5almhd6;tcyjy-: uo cpm * 254afx j7yaw(ozb(iq0 8gwhu47 th ll her weight on each pedal when climbing a hill. The pedals rotate ii(g0qw u8 wo4hz7t(bhn a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?