gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprocketsrm1 /gojdll z03f/va9 at thec*o+- gjb:eos :7xtdo 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 f:xbj-7 sc*togo+ :deo ront sprocket or a large front sprocket? Why?

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