[填空题]
A 55-kg person riding a bike puts all-afqnl rtg0:- ho:qao2;jrlubx w 1: o)er weight on each pedal when climbing a hill. The pedals rotate inbx;j:1q r o):aw2oulo a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?