[填空题]
A 55-kg person riding a h na +uk 4sf4:lq,l,2t2tl unnbike puts all olt,-+c o1 wljher weight on each pedal when climbing a htljc o1-+ow, lill. The 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?