[填空题]
A 55-kg person riding8pc ti7.kxqh 4e, j7wo a bike puts ausgq:s7 bu :megi(e; (ll her weight on each pedal when climbing a hill. The ( bqum;se7g:sige(u: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?