gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

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本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 unclassified

[问答题]
A 21-speed bicycle has seven sprockets at t+ i0hbs ti2rl1tci/ stqn (/d582n cdzhe rear wheevu y;+h )d3+ bbqfcpn/l and three at the pedal cranks. In 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 fr/u)c d y;nb3+vp+bfqhont sprocket or a large front sprocket? Why?

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