[填空题]
A 55-kg person riding a bike puts all herwcny-.gn/gpjr :1qa ; wpal6 ,f *2+41nf zc tjmlat;feeight on each pedal when climbing a hill. The;j a 4af,tc ln 61t+lfz2*epmf 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?