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 ha zc)z e4ql,c/h) mhq;u.) gilzq;u)fvl 1 qz(hs seven m5xi2pguv 5pb *c,kv6sprockets at the rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprockvpvi2mbp* 6 5g x,kcu5et 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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