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【单选题】
一质量为M=15kg、半径为R=0.3m的圆柱体, 可绕与其几何轴重合的水平固定轴转动(转动惯量 )。现以一不能伸长的轻绳绕于柱面, 而在绳的下端悬一质量m=8.0kg的物体, 不计圆柱面和轴之间的摩擦, 物体自静止下落, 则绳中的张力是()。A.
70.1N
B.
58.4N
C.
37.9N
D.
28.5N
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