[填空题]
A 55-kg person riding a bike mx7+ 7:pyihyi puts6 8a5x g23jn kiazu8 *60ywqneam zf4d all her weight on each pedal when climbing a hill. The pedals njza63q6xga mw8z an 0kde*iy248uf 5rotate 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?