[填空题]
A 55-kg person riding a bike putl20kpwy3z+mnq3i mn,)j 0fg zcp.b 4ms all her weight on eachoy1l i6wt0mr) pedal when climbing a hill. The pedals rotate in a circle i6t 1yr0o) wmlof radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?