[填空题]
A 55-kg person riding a bike puts all her weight ovh)yx+hm3 jsb h/ku6* /w/whon each pedal when c9r0o oaf ;vq42d(epb;i err aag *bd/z/q.j7 slimbing a hill. The pedals rotate ini9seaa;/odz*ve b f2 ar7 qqb4d(grr p;/0 oj. a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?