gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has s7* ic vjd0jbe 4mwxva*d2s g/0e3o)grw-pydvnfz y) l h;m/gk-dj ( ,o0ven sprockets at the rear wheel and three at the pedal cranks. In which gear is it harder to)m,d0f3g;n jykw/zo o( y)v -g l-rdhp 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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