[填空题]
A 55-kg person riding a bike puts al,hvy,athr bfl0gux7sz* mpl(:ow / ,/l np:uii,fafq083nv z n p;q 0xyk+j)g,her weight on each pedal when climbing a hill. Th3xvn, pqjnyi:+ikgf );z 0uq ap 0,nf8e 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?