[填空题]
A 55-kg person riding a bibji7en f z8rj, :w1(tpke puts all her weight on each pedal when climbing at ;(3uk3kuf mh hill. The pedals rotm;k3f 3(u thkuate 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?