gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

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本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 unclassified

[问答题]
A 21-speed bicycle has seven sprockets at the rear wheeye ,fzr f0yx.;l and thre 8bq+yt,f7)tez )j wvoe at the pedal cranks. In which gear is it harder to pedal, a smal tq+ yj))z7eo fvtwb,8l 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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