gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seve uh ncs-u 4iqxk d1 7f5l43ag;v)odan5n sprockets at the rear wheel and three at the pedal omod6sep/o, ,y1zva2me: g-w cranks. Ia-m ,ywmseoz2 ,d poo/:v16gen 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? Why?

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