gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has se hr68p0pinc 1jw k*g 1nqis/n,ven sprockets at th3jmui7 v2+a uf.i(ft je rear wheel and three at the pedal cranks. In which gear 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? Why3jv(u+7j.i ut mf2fia?

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