[填空题]
A 55-kg person riding a bike puts all her wei;(pxow0 o)s6k g*tl t urr+u0x)d( bopght o :1alxo)rm/vfmd c+5 dn each pedal when climbing a hil :1 raxld5 o/)vf+cmdml. The 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?