[填空题]
A 55-kg person riding a bike p +rmg8lylfwg+g6.5e pu6rs3 8rtgwq.u p: sdt)ts all her weight on each pedal when climbing a hill. The pedals rotate iu3w rs tqr )tdspg.:86n a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?