[填空题]
A 55-kg person riding a bike puts all her weight o2d a8 -bs rqh0dkn0)ljn each pedal whe6j k td)9mnm6zn5sx 3qe ou56bn climbing a hill. The pedals rotate in a circle of radius 1un x) d5636tbj ze9m6q5msok n7 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?