gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven seykdlj7z+ tc u0:1t2 xpi9 w:f,amh 7tprockets at the 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 sprocketip f9m,:h7a wt or a large front sprocket? Why?

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