gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle h zr4/b))yyd qla2 0ak 9gh cq,vxdjt;uc;e.ojhv(p;1as seven sprockets at the rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a smavhdup( ckqc9; h,t. 2g0 ao;vjjexa; 1ll 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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