[填空题]
A 55-kg person riding a bike pl (;hqhtr wz3/uts all her weight on each pedal yu;rt hi8 obg00td) o6ok-s5 p58 zubowhen climbing a hill. The )pyoo060obib;skd ut ou5 ghr zt588-pedals rotate in a circle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?