[填空题]
A 55-kg person riding a bike puts alone xaq;7;ms, l her weight on each pedal when climbi gn4vs:u2la jyptxn.(q;5 gcv(f ,:otng a hill. The pedals rotate in a circle sq:x(f(vnv gntauy.olcj;4,5g : 2pt of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?