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 wheel and three at tuxwl6k .t;nlnl/rh 0is(9y y5 he w) .xliy6x 8l3blbnw4pedal cranks. In which gear is it harder to pedal, a small rear sproc y3)4bxlwwx8l 6bn .ilket 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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