[填空题]
A 55-kg person ridinu )(ptlv. bm8tg ac7ul) lbj:/ oo bike puts all her weight on each pedal when climbing a hill. The pedals rotao7/loub: c jl)te 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?