[填空题]
A 55-kg person riding a bike puts, :4tmqq+c jde all her weighrbdgzs5b k05c u /v9v8t on each pedal when climbing a hill. 85 u 0b/vd bzrkg5cs9vThe 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?