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試卷名稱：106年 - 學士後西醫物理及化學106物理#77053
年份：106年
科目：學士後西醫物理及化學
4. A rod of length L and mass M is placed along the x-axis with one end at the origin, as shown in the figure below. The rod has linear mass density 
, where x is the distance from the origin. Which of the following gives the x-coordinate of the rod’s center of mass?
(A) 
(B) 
(C)
(D)
(E)