gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has sevjo,jo p 3,m7 +ssnzfi+en sprockets at the rear wheel and tdzh:0x/:6o v vdr o*qthree 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 front sproov6*rxtq:dv h/ od0: zcket or a large front sprocket? Why?

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