[填空题]
A 55-kg person riding a bike puts all her weight on each p(4w vo o/ 50frft69 q4xdz)ktbr3izznedal when clihry7 wx 1dt*.xmbing a hill. The pedals rotate in a circle of radius 17 cm hx.1w7rt*xy d. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?