gc textbook chapter 8 Rotational Motion (id: f1a5b03e2)

[问答题]
A 21-speed bicycle has seven sprocksvg8zvq*tw+68zr . 4 ncy8e;o3bu dlz ets at the rear whe8tk vk.wsdm3ad+c. 3a0b nk+qel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprocket or a large reat8w.m0 +b.n+sakavd3ckk 3 dqr sprocket? Why? In which gear is it harder to pedal, a small front sprocket or a large front sprocket? Why?

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