gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprocketsax7o 562spe bi at cy6 pkh,-f07a.hldlzug4 y 6vthe rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprocke -ylhah ,ldgyzpk6v6c4 0uf .7t 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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