[填空题]
A 55-kg person riding nx fmi+54z6(sh2dd8gtib 5td a bike h: ao n0zd1/.ff ya:n6k7ckw qputs all her weight on each pedal when climbing a hill. The pedals yf6oa/::7qk f1d0 nhn . cwazkrotate 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?