本题目来源于试卷: gc textbook chapter 7 Linear Momentum，类别为 通用国际物理
[问答题]
Why is the CM of a 1-0a8 k1bu/cd2 pn/bb,nlon 0rxm length ofsc,*sl 4 1n s*hnbqip, pipe at its mid-point, whereas this is not true for your arm o h,4bcn*p, snl1*si qsr leg?
参考答案:
The 1-m length of pipe is uniform – it has the
same density throughout, and so its CM is at its geometric center, which is its
midpoint. The arm and leg are not
uniform – they are more dense where there is muscle, primarily in the parts
that are closest to the body. Thus the
CM of the arm or leg is closer the body than the geometric center. The CM is located closer to the more massive
part of the arm or leg.
本题详细解析:
暂无
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