gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear wes*;;qkagh . dhee hm3:uvub+tzd ,gg: y2l 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 u:zhym d3 ,2:uvggb+tto pedal, a small front sprocket or a large front sprocket? Why?

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