gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has sevemx7kmoe u3ap(/k yl5-n sz6loh5(.lyku -u 85qt)qsxcxprockets 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 harder to pedal, a small front sprocket ooqtclqh-.s5k uy6z (uxlx85) r a large front sprocket? Why?

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