gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven 4f7g 2k* b-qh.v vcdopsgp9o2sprocketdw q h*4euidxtt/9 p 77anwg0 29m8ccks at the rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprocket or a large rea8gq 4/dc77 uwaxem itptdkc0*29wh9n r sprocket? Why? In which gear is it harder to pedal, a small front sprocket or a large front sprocket? Why?

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