本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 通用国际物理
[问答题]
A 21-speed bicycle has seven sprockkaoc fr6b2ghp4r7 l* (ets at the rear wheel and t nwa9 hw/zw-;wvfe3jau3g8j5hree at the pedal cranks. In which gea3z/e5 -h ;wunjgwvja3 9wfw 8ar 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 sprocket? Why?
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