gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprocketsbzrz*)z-,4d5 yw sj+gd+ v amf at the+sx4n7kgwfp+vu+a l + rear wheel and three at the pedal cranks. In which gek 7g wx+p+f+lv4 u+sanar 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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