gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprockets at the rear)d)m*bvj0 l tef br8 h,7yypv8 wheel and th.u zk6j(-- 1qapul j3nwois t3ree at the pedal cranks. In which gear is it harder iwlqu opk6-j (1-j ntsza.3 u3to 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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