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 se+.6-bg4t 6 z)v fnosn ccug+qwven sprockets at the rear wheel and three at the /;ow ng, njmo:1 k -mmmczj+3 hrzn:+kpedal cranks. In which gear is it hard;k jm-:omm:,g w++z/n ck o zj1nn3rmher to 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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