[填空题]
A 55-kg person riding p)4;y1tn o2bp d4+k hitf:x) yh1sjjoa bikwyvj-dd*. x8 re puts all her weight on each pedal when climbing a hill. The pedals rotate in .-yr jxw8 dd*va circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?