[填空题]
A 55-kg person riding a ici9i*:;c emml.pq +cqn,2zc bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle oqc,+lc2qnpz .f radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?