[填空题]
A 55-kg person riding a bike puts all her weight on each pedal when climt j*avyo+)z2zx:r9 bz 20 l((jpwsgi vbing atj8 1b2bfnh s52kx3wn hill. The pedals rota nw2kxh1fbnb38sj t25te 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?