[填空题]
A 55-kg person riding a bike p 5*k(nii4r .o c /z1bcqmmsd2wuts all; wdidh9:wmw-ka 9gm+ her weight on each pedal when climbing a hill. The pedals rotate in a cir;wi- kw9mga9dmh+w:d cle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?