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*4s2wo h p7wbc rear wheel and three at the p *7 uqwun5/trfwsl)kin t:znn,q 6l.4edal cranks. In which gear is it harder to p, tl q:f)q n.5tsnu r*iu lnnw6zw74/kedal, 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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