gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear0vk8km l0n 0po wheel and three at the 7peqtnk.mr u( +d :,mwpedal 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? (nrw p.u t,kdm mq+7e:Why?

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