gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear wig/rjj 4 v+s-uheel and three at tfvaa:nw;jbmu2 * p.,xhe pedal cranks. In which gear is it harder to pedal, a small rear sprocket o:b;nwm* ,.aaf pj2u vxr 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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