[填空题]
A 55-kg person ridingl 1jeo *x9x5ni a bike p9tdqi/ a l+o(ll+ 3yimuts all her weight on each pedal when climbing a hiaiy++/i lq3 t9dlmlo (ll. The pedals 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?