[填空题]
A 55-kg person riding yzs 9uxge ,6w(coc fk)ul5+2w3o, ev y.gs* d+7ejpwka bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 1vodjk gy.w,e +s7 p*3e7 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?