[填空题]
A 55-kg person riding a bike puts all her weight on e vpq:aein2lj 7:ua7bv;ny2 3w ach pedal w rv0wxpcn))h3 hen climbing a hill. The pedals ro) rwx)v03pcn htate 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?