[填空题]
A 55-kg person riding a bike mdxrrm+e-ckw*ho58 ; pu-t2n dk:l) pqhdw6 bzjk -nh61c+e9wtts all her weight on each pedal when climbing a hid6l wj2 -tqp nwkh)bk-zt1nh+ :d69ecll. 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?