gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven hf *l 8dl/t5x ;udc7scsprockets at the rear wheel1w6 .hf gmiji4a ch- a,46dg/-pqfjk d 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,f--6dch44gq jkgjph f/w da6aim i.1 front sprocket or a large front sprocket? Why?

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