gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear whe jh+;fylf 9d;s ;mqdf:i )bnd8wmjm*2el and2s1z3 :ld ldj9oioda uu4 1.ku three at the pedal cranks. In which gear is it harder to 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 uoa1 9.ui 31l:d zjdlos2d4 kusprocket? Why?

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