[填空题]
A 55-kg person riding a bike puts all her weight on each pedal when climbing:t)6o * m4ptlvga vb*sgv,, yv v;-tgp a llt py7s e gje:4 pk1qi-7; e 8ko+(sbi*k5etthill. The pedals rotate in a cirtb + plepe-j 7 gle1e5*q8;o7ky :t4ii(tsk kscle of radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?