[填空题]
A 55-kg person riding a bike pp a wuu-t2)r5v4sbur.p) api )7caq u:uts all h/7dqf8y m; edjer weight on each pedal when climbing a hill. The pedals rotate in a circle of;mdj ye/ 8qdf7 radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?