[填空题]
A 55-kg person riding a bike puts all her *7sf6oqo8n +vevrti - weight on each pedal when clim5sr )d f9yeng3bing a hill. The pedals rotate in a circle oyr9nfgd)5 e 3sf radius 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?