[填空题]
A 55-kg person ridinrmz+n,t ;t: 45q njqvrgi6z+-tub wvkt47h0r bfx ,b3i a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of 3, bvhkbbftt-r0z7 6 +xi4iu wradius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?