gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle hasxqn6t3 k2o (b 1rm6nz+k/tsx x2yf,sx sevw .j5u-r d.;x x.libyien sprockets at the rear wheel 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 hardeu.l.xwd i y5;j b-xir.r to pedal, a small front sprocket or a large front sprocket? Why?

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