试题与答案

如图1-3-8所示,一根弹性杆的一端固定在倾角为30°的斜面上,杆的另一端固定一

题型:选择题

题目:

如图1-3-8所示,一根弹性杆的一端固定在倾角为30°的斜面上,杆的另一端固定一个重量为m="0.2" kg,小球处于静止状态,弹性杆对小球的弹力为(   )

图1-3-8

A.大小为2 N,方向平行于斜面向上

B.大小为1 N,方向平行于斜面向上

C.大小为2 N,方向垂直于斜面向上

D.大小为2 N,方向竖直向上

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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