[填空题]
A 55-kg person riding a bike puo9l m(u 9(j* wq3d;dhq3euqcd ubk t; a0gf0n*x(ht n6ts all her weight on each pedal when climbing a hill. Txukat0 0h *bt 6(gfnn;he pedals rotate 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?