[填空题]
A 55-kg person riding6)iiq 4c9r9omu s6u yq a bike puts all her weigh5 . iktc3jyt,dt on each pedal when climbing a hill. The pedals rotate in a circle of rk.djc35i, yt tadius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?