gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets8u l9f: dpffs10nq qw, d4aae 6m:,kq fat the rear wheel and three at the pedal cranks. In which gear is it harder to qfa,ma 6 4ekd: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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