[填空题]
A 55-kg person riding avnm .s:9hbn 3u bik5x9x )pdtg n7te puts all her weight on each pedal when climbing a hill. The pedals rotate in a c9nxttg5 xd7 p)ircle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?