[填空题]
A 55-kg person riding a bike puts all her . 4u/hsbiy4bv weight on each pedal when i;gfmt .yi.y*cvqi6qszaw yo241 m3- climbing a hill. The pe*m-3. fiy; 1yi.2qqzs4wvct6am yiogdals 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?