如图甲所示,平台ON上有一轻质弹簧,其左端固定于竖直挡板上,右端与质量
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Em%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmn%3E.%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmtext%3Ek%3C%2Fmtext%3E%3Cmtext%3Eg%3C%2Fmtext%3E%3C%2Fmath%3E)
、可看作质点的物块A相接触(不粘连),OP段粗糙且长度等于弹簧原长。PN段光滑,上面有静止的小滑块B、C,
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EB%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E.%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3Cmtext%3Ek%3C%2Fmtext%3E%3Cmtext%3Eg%3C%2Fmtext%3E%3C%2Fmath%3E)
,
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EC%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmn%3E.%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3Cmtext%3Ek%3C%2Fmtext%3E%3Cmtext%3Eg%3C%2Fmtext%3E%3C%2Fmath%3E)
, 滑块B、C之间有一段轻弹簧刚好处于原长,B与轻弹簧连接,滑块C未连接弹簧,两滑块离N点足够远。物块A开始静止于P点,现对物块施加一个水平向左的外力F,大小随位移x变化关系如图乙所示。物块A向左运动x=0.40m后撤去外力F,此后物块A向右运动到离开P点时的速度为v
0=4m/s,A与B碰撞后粘合在一起,碰撞时间极短。滑块C脱离弹簧后滑上倾角θ=37°的传送带,并刚好到达传送带顶端。已知滑块C与传送带之间的动摩擦因数μ=0.50,水平面MN右端N处与倾斜传送带理想连接,传送带以恒定速度v=1m/s顺时针转动,重力加速度g=10m/s
2 , sin37°=0.6,cos37°=0.8。 求:
![](http://tikupic.21cnjy.com/2022/05/10/59/1a/591abb2f69106362da708ea4b34b4ac1_636x175.png)