gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear*gg,yp;duq9b - xcj4(dnhc y3 wheel and threem5p8guo(dy 4 j at the pedal cranks. In which gear is it harder todu4y(8 j pg5mo pedal, a small rear sprocket or a large rear sprocket? Why? In which gear is it harder to pedal, a small front sprocket or a large front sprocket? Why?

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