gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear wheel and threx ,xr 0:gr+wi55hhrfpe at th/:h; -eec rlnb y p/6kx,hc.aqe pedal cranks. In which gear is it harder to pedal, a small rear sprockehxepr. 6nq-bacy/;/:lc,k h et 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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