[填空题]
A 55-kg person riding a bike puts all her weight on each pedaowmizc/z4u 1 r/)f )-; tyoepql when climbing a f dexx++cpfh-0jy z/*hill. The pedals rotate in a circle of radid/yjh- zfpxe c f0+x*+us 17 cm. (a) What is the maximum torque she exerts? $m \cdot N$ (b) How could she exert more torque?