[填空题]
A 55-kg person riding jhs n7.2-arcy:-x3mf kw t+jfa bike puts all her wec7fm6 8gecjq lqm7y 12ight on each pedal when climbing a hill. The peda2 j6 q8cmlfeg qy717cmls 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?